# Write float arrays to a text file

Write two equal-sized numerical arrays 'x' and 'y' to a two-column text file named 'filename'.

Write float arrays to a text file
You are encouraged to solve this task according to the task description, using any language you may know.

The first column of the file contains values from an 'x'-array with a given 'xprecision', the second -- values from 'y'-array with 'yprecision'.

For example, considering:

```   x = {1, 2, 3, 1e11};
y = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791};
/* sqrt(x) */
xprecision = 3;
yprecision = 5;
```

The file should look like:

```   1    1
2    1.4142
3    1.7321
1e+011   3.1623e+005
```

This task is intended as a subtask for Measure relative performance of sorting algorithms implementations.

```with Ada.Text_IO;                       use Ada.Text_IO;

procedure Write_Float_Array is
type Float_Array is array (1..4) of Float;
procedure Write_Columns
(  File   : File_Type;
X      : Float_Array;
Y      : Float_Array;
X_Pres : Natural := 3;
Y_Pres : Natural := 5
) is
begin
for I in Float_Array'range loop
Put (File => File, Item => X(I), Fore => 1, Aft => X_Pres - 1);
Put (File, " ");
Put (File => File, Item => Y(I), Fore => 1, Aft => Y_Pres - 1);
New_Line (File);
end loop;
end Write_Columns;

File : File_Type;
X : Float_Array := (1.0, 2.0, 3.0, 1.0e11);
Y : Float_Array;
begin
Put ("Tell us the file name to write:");
Create (File, Out_File, Get_Line);
for I in Float_Array'range loop
Y(I) := Sqrt (X (I));
end loop;
Write_columns (File, X, Y);
Close (File);
end Write_Float_Array;
```

## ALGOL 68

Works with: ALGOL 68 version Revision 1 - no extensions to language used
Works with: ALGOL 68G version Any - tested with release 1.18.0-9h.tiny
```PROC writedat = (STRING filename, []REAL x, y, INT x width, y width)VOID: (
FILE f;
INT errno = open(f, filename, stand out channel);
IF errno NE 0 THEN stop FI;
FOR i TO UPB x DO
# FORMAT := IF the absolute exponent is small enough, THEN use fixed ELSE use float FI; #
FORMAT repr x := ( ABS log(x[i])<x width | \$g(-x width,x width-2)\$ | \$g(-x width,x width-4,-1)\$ ),
repr y := ( ABS log(y[i])<y width | \$g(-y width,y width-2)\$ | \$g(-y width,y width-4,-1)\$ );
putf(f, (repr x, x[i], \$" "\$, repr y, y[i], \$l\$))
OD;
close(f)
);
# Example usage: #
test:(
[]REAL x = (1, 2, 3, 1e11);
[UPB x]REAL y; FOR i TO UPB x DO y[i]:=sqrt(x[i]) OD;
printf((\$"x before:"\$, \$xg\$, x, \$l\$));
printf((\$"y before:"\$, \$xg\$, y, \$l\$));
writedat("sqrt.dat", x, y, 3+2, 5+2);

printf(\$"After:"l\$);
FILE sqrt dat;
INT errno = open(sqrt dat, "sqrt.dat", stand in channel);
IF errno NE 0 THEN stop FI;
on logical file end(sqrt dat, (REF FILE sqrt dat)BOOL: stop);
TO UPB x DO
STRING line;
get(sqrt dat, (line, new line));
print((line,new line))
OD
)```
Output:
```x before: +1.00000000000000e  +0 +2.00000000000000e  +0 +3.00000000000000e  +0 +1.00000000000000e +11
y before: +1.00000000000000e  +0 +1.41421356237310e  +0 +1.73205080756888e  +0 +3.16227766016838e  +5
After:
1.000 1.00000
2.000 1.41421
3.000 1.73205
1e11  316228
```

## Amazing Hopper

Version hopper-FLOW:

```#include <flow.h>

DEF-MAIN(argv,argc)

VOID( x ), MSET( y, f )

MEM(1,2,3,1.0e11), APND-LST(x), SET( y, x )
SET-ROUND(5), SQRT(y), MOVE-TO(y)
UNSET-ROUND

CAT-COLS( f, y, x )
TOK-SEP( TAB ), SAVE-MAT(f, "filename.txt" )
END```
Output:
```\$ cat filename.txt
1	1
2	1.41421
3	1.73205
1e+11	316228
```

## Applesoft BASIC

``` 100 D\$ =  CHR\$ (4)
110 F\$ = "FILENAME.TXT"
130  DATA 1,2,3,1E11
140  DATA 1,1.4142135623730951,1.7320508075688772,316227.76601683791
150 XPRECISIO = 3
160 YPRECISIO = 5
170  PRINT D\$"OPEN"F\$
180  PRINT D\$"CLOSE"F\$
190  PRINT D\$"DELETE"F\$
200  PRINT D\$"OPEN"F\$
210  PRINT D\$"WRITE"F\$
220  FOR I = 0 TO 3
230      P = XPRECISIO:N = X(I): GOSUB 300
240      PRINT " ";
250      P = YPRECISIO:N = Y(I): GOSUB 300
260      PRINT
270  NEXT I
280  PRINT D\$"CLOSE"F\$
290  END
300 O = N
310 E = 0
320  IF O >  = 10 THEN  GOSUB 390
330  IF O < 1 THEN  GOSUB 450
340  LET O =  INT ( INT (O * (10 ^ P)) / 10 + .5) / (10 ^ (P - 1))
350  PRINT O;
360  IF E > 0 THEN  PRINT "E+" RIGHT\$ ("00" +  STR\$ (E),3);
370  IF E < 0 THEN  PRINT "E-" RIGHT\$ ("00" +  STR\$ ( - E),3);
380  RETURN
390  FOR Q = 0 TO 1
400      O = O / 10
410      E = E + 1
420      Q =  NOT (O >  = 10)
430  NEXT Q
440  RETURN
450  FOR Q = 0 TO 1
460      O = O * 10
470      E = E - 1
480      Q =  NOT (O < 1)
490  NEXT Q
500  RETURN
```

## AWK

As usual, the order of array traversal in AWK is not necessarily the same as the input had:

```\$ awk 'BEGIN{split("1 2 3 1e11",x);
> split("1 1.4142135623730951 1.7320508075688772 316227.76601683791",y);
> for(i in x)printf("%6g %.5g\n",x[i],y[i])}'
1e+11 3.1623e+05
1 1
2 1.4142
3 1.7321
```

For the text file part of the task, just redirect stdout to it.

## BASIC256

```x\$ = "1 2 3 1e11"
x\$ = explode(x\$, " ")

f = freefile
open f, "filename.txt"

for i = 0 to x\$[?]-1
writeline f, int(x\$[i]) + chr(9) + round(sqrt(x\$[i]),4)
next i
close f```

## BBC BASIC

```      DIM x(3), y(3)
x() = 1, 2, 3, 1E11
FOR i% = 0 TO 3
y(i%) = SQR(x(i%))
NEXT

xprecision = 3
yprecision = 5

outfile% = OPENOUT("filename.txt")
IF outfile%=0 ERROR 100, "Could not create file"

FOR i% = 0 TO 3
@% = &1000000 + (xprecision << 8)
a\$ = STR\$(x(i%)) + CHR\$(9)
@% = &1000000 + (yprecision << 8)
a\$ += STR\$(y(i%))
PRINT #outfile%, a\$ : BPUT #outfile%, 10
NEXT

CLOSE #outfile%
```
Output:
```1	1
2	1.4142
3	1.7321
1E11	3.1623E5
```

## C

```#include <stdio.h>
#include <math.h>

int main(int argc, char **argv) {

float x[4] = {1,2,3,1e11}, y[4];
int i = 0;
FILE *filePtr;

filePtr = fopen("floatArray","w");

for (i = 0; i < 4; i++) {
y[i] = sqrt(x[i]);
fprintf(filePtr, "%.3g\t%.5g\n", x[i], y[i]);
}

return 0;
}
```

The file "floatArray" then contains the following:

```1       1
2       1.4142
3       1.7321
1e+11   3.1623e+05
```

## C#

```using System.IO;

class Program
{
static void Main(string[] args)
{
var x = new double[] { 1, 2, 3, 1e11 };
var y = new double[] { 1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791 };

int xprecision = 3;
int yprecision = 5;

string formatString = "{0:G" + xprecision + "}\t{1:G" + yprecision + "}";

using (var outf = new StreamWriter("FloatArrayColumns.txt"))
for (int i = 0; i < x.Length; i++)
outf.WriteLine(formatString, x[i], y[i]);
}
}
```
Output:
```1	1
2	1.4142
3	1.7321
1E+11	3.1623E+05```

## C++

Function writedat():

```template<class InputIterator, class InputIterator2>
void writedat(const char* filename,
InputIterator xbegin, InputIterator xend,
InputIterator2 ybegin, InputIterator2 yend,
int xprecision=3, int yprecision=5)
{
std::ofstream f;
f.open(filename);
for ( ; xbegin != xend and ybegin != yend; ++xbegin, ++ybegin)
f << std::setprecision(xprecision) << *xbegin << '\t'
<< std::setprecision(yprecision) << *ybegin << '\n';
}
```

Example:

```#include <algorithm>
#include <cmath>    // ::sqrt()
#include <fstream>
#include <iomanip>  // setprecision()
#include <iostream>
#include <string>
#include <vector>

int main()
{
try {
// prepare test data
double x[] = {1, 2, 3, 1e11};
const size_t xsize = sizeof(x) / sizeof(*x);
std::vector<double> y(xsize);
std::transform(&x[0], &x[xsize], y.begin(), ::sqrt);

// write file using default precisions
writedat("sqrt.dat", &x[0], &x[xsize], y.begin(), y.end());

// print the result file
std::ifstream f("sqrt.dat");
for (std::string line; std::getline(f, line); )
std::cout << line << std::endl;
}
catch(std::exception& e) {
std::cerr << "writedat: exception: '" << e.what() << "'\n";
return 1;
}
return 0;
}
```
Result:
```1       1
2       1.4142
3       1.7321
1e+11   3.1623e+05
```

## COBOL

```       identification division.
program-id. wr-float.
environment division.
input-output section.
file-control.
select report-file assign "float.txt"
organization sequential.
data division.
file section.
fd report-file
report is floats.
working-storage section.
1 i binary pic 9(4).
1 x-values comp-2.
2 value 1.0.
2 value 2.0.
2 value 3.0.
2 value 1.0e11.
1 redefines x-values comp-2.
2 x occurs 4.
1 comp-2.
2 y occurs 4.
report section.
rd floats.
1 float-line type de.
2 line plus 1.
3 column 1 pic -9.99e+99 source x(i).
2 column 12 pic -9.9999e+99 source y(i).
procedure division.
begin.
open output report-file
initiate floats
perform varying i from 1 by 1
until i > 4
compute y(i) = function sqrt (x(i))
generate float-line
end-perform
terminate floats
close report-file
stop run
.
end program wr-float.
```
Result:
``` 1.00E+00   1.0000E+00
2.00E+00   1.4142E+00
3.00E+00   1.7321E+00
1.00E+11   3.1623E+05
```

## Common Lisp

```(with-open-file (stream (make-pathname :name "filename") :direction :output)
(let* ((x (make-array 4 :initial-contents '(1 2 3 1e11)))
(y (map 'vector 'sqrt x))
(xprecision 3)
(yprecision 5)
(fmt (format nil "~~,1,~d,,G~~12t~~,~dG~~%" xprecision yprecision)))
(map nil (lambda (a b)
(format stream fmt a b)) x y)))
```

Using CLISP I get

```1.          1.0000
2.          1.4142
3.          1.7321
1.0E+011    3.16228E+5
```

## D

```import std.file, std.conv, std.string;

void main() {
auto x = [1.0, 2, 3, 1e11];
auto y = [1.0, 1.4142135623730951,
1.7320508075688772, 316227.76601683791];
int xPrecision = 3,
yPrecision = 5;

string tmp;
foreach (i, fx; x)
tmp ~= format("%." ~ text(xPrecision) ~ "g      %." ~
text(yPrecision) ~ "g\r\n", fx, y[i]);

write("float_array.txt", tmp);
}
```
Output:
```1	1
2	1.4142
3	1.7321
1e+11	3.1623e+05```

## Delphi

```program Write_float_arrays_to_a_text_file;

{\$APPTYPE CONSOLE}

uses
System.SysUtils,
System.IoUtils;

function ToString(v: TArray<Double>): TArray<string>;
var
fmt: TFormatSettings;
begin
fmt := TFormatSettings.Create('en-US');
SetLength(Result, length(v));

for var i := 0 to High(v) do
Result[i] := v[i].tostring(ffGeneral, 5, 3, fmt);
end;

function Merge(a, b: TArray<string>): TArray<string>;
begin
SetLength(Result, length(a));
for var i := 0 to High(a) do
Result[i] := a[i] + ^I + b[i];
end;

var
x, y: TArray<Double>;

begin
x := [1, 2, 3, 1e11];
y := [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791];

TFile.WriteAllLines('FloatArrayColumns.txt', Merge(ToString(x), ToString(y)));
end.
```
Output:
```1	1
2	1.4142
3	1.7321
1E011	3.1623E005```

## Elixir

```defmodule Write_float_arrays do
def task(xs, ys, fname, precision\\[]) do
xprecision = Keyword.get(precision, :x, 2)
yprecision = Keyword.get(precision, :y, 3)
format = "~.#{xprecision}g\t~.#{yprecision}g~n"
File.open!(fname, [:write], fn file ->
Enum.zip(xs, ys)
|> Enum.each(fn {x, y} -> :io.fwrite file, format, [x, y] end)
end)
end
end

x = [1.0, 2.0, 3.0, 1.0e11]
y = for n <- x, do: :math.sqrt(n)
fname = "filename.txt"

precision = [x: 3, y: 5]
```
Output:
```1.0     1.00
2.0     1.41
3.0     1.73
1.0e+11 3.16e+5

1.00    1.0000
2.00    1.4142
3.00    1.7321
1.00e+11        3.1623e+5
```

## Erlang

Erlang thinks 1 is an integer. To persuade it otherwise I have to use 1.0.

```-module( write_float_arrays ).

File = "afile",
Xs = [1.0, 2.0, 3.0, 1.0e11],
Ys = [1.0, 1.4142135623730951, 1.7320508075688772, 316227.76601683791],
Options = [{xprecision, 3}, {yprecision, 5}],
to_a_text_file( File, Xs, Ys, Options ),
{ok, Contents} = file:read_file( File ),
io:fwrite( "File contents: ~p~n", [Contents] ).

to_a_text_file( File, Xs, Ys ) -> to_a_text_file( File, Xs, Ys, [] ).

to_a_text_file( File, Xs, Ys, Options ) ->
Xprecision = proplists:get_value( xprecision, Options, 2 ),
Yprecision = proplists:get_value( yprecision, Options, 2 ),
Format = lists:flatten( io_lib:format("~~.~pg ~~.~pg~n", [Xprecision, Yprecision]) ),
{ok, IO} = file:open( File, [write] ),
[ok = io:fwrite( IO, Format, [X, Y]) || {X, Y} <- lists:zip( Xs, Ys)],
file:close( IO ).
```
Output:
```3> write_float_arrays:task().
File contents: <<"1.00 1.0000\n2.00 1.4142\n3.00 1.7321\n1.00e+11 3.1623e+5\n">>
```

## Euphoria

```constant x = {1, 2, 3, 1e11},
y = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}

integer fn

fn = open("filename","w")
for n = 1 to length(x) do
printf(fn,"%.3g\t%.5g\n",{x[n],y[n]})
end for
close(fn)```

## F#

```[<EntryPoint>]
let main argv =
let x = [ 1.; 2.; 3.; 1e11 ]
let y = List.map System.Math.Sqrt x

let xprecision = 3
let yprecision = 5

use file = System.IO.File.CreateText("float.dat")
let line = sprintf "%.*g\t%.*g"
List.iter2 (fun x y -> file.WriteLine (line xprecision x yprecision y)) x y
0
```

Content of File, visualized with TAB=8

```1       1
2       1.4142
3       1.7321
1e+11   3.1623e+05```

## Forth

Works with: GNU Forth
```create x  1e f, 2e       f, 3e       f, 1e11       f,
create y  1e f, 2e fsqrt f, 3e fsqrt f, 1e11 fsqrt f,

: main
s" sqrt.txt" w/o open-file throw  to outfile-id

4 0 do
4 set-precision
x i floats + f@ f.
6 set-precision
y i floats + f@ f. cr
loop

outfile-id  stdout to outfile-id
close-file throw ;
```

## Fortran

### Fortran 90

Works with: Fortran version 90 and later
```program writefloats
implicit none

real, dimension(10) :: a, sqrta
integer :: i
integer, parameter :: unit = 40

a = (/ (i, i=1,10) /)
sqrta = sqrt(a)

open(unit, file="xydata.txt", status="new", action="write")
call writexy(unit, a, sqrta)
close(unit)

contains

subroutine writexy(u, x, y)
real, dimension(:), intent(in) :: x, y
integer, intent(in) :: u

integer :: i

write(u, "(2F10.4)") (x(i), y(i), i=lbound(x,1), ubound(x,1))
end subroutine writexy

end program writefloats
```

The arrays x and y should have same bounds (and size); this constraint is not checked.

### Fortran 77

```      program writefloats
integer i
double precision x(4), y(4)
data x /1d0, 2d0, 4d0, 1d11/

do 10 i = 1, 4
y = sqrt(x)
10 continue

open(unit=15, file='two_cols.txt', status='new')
write(15, '(f20.3,f21.4)') (x(i), y(i), i = 1, 4)
end
```

## FreeBASIC

```' FB 1.05.0 Win64

Dim x(0 To 3) As Double = {1, 2, 3, 1e11}
Dim y(0 To 3) As Double = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}

Open "output.txt" For Output As #1
For i As Integer = 0 To 2
Print #1, Using "#";  x(i);
Print #1, Spc(7); Using "#.####"; y(i)
Next
Print #1, Using "#^^^^"; x(3);
Print #1, Spc(2); Using "##.####^^^^"; y(3)
Close #1
```

Contents of output.txt :

Output:
```1       1.0000
2       1.4142
3       1.7321
1E+11   3.1623E+05
```

## FutureBasic

```local fn DoIt
NSUInteger  i
CFStringRef s
CFArrayRef  x = @[@1, @2, @3, @1e11]
CFArrayRef  y = @[@1, @1.4142135623730951, @1.7320508075688772, @316227.76601683791]
CFMutableStringRef mutStr = fn MutableStringWithCapacity(0)

CFURLRef desktopURL = fn FileManagerURLForDirectory( NSDesktopDirectory, NSUserDomainMask )
CFURLRef        url = fn URLByAppendingPathComponent( desktopURL, @"Array_to_file.txt" )

for i = 0 to 3
if ( i < 3 )
s = fn StringWithFormat( @"%ld    \t", fn NumberIntegerValue( x[i] ) )
MutableStringAppendString( mutStr, s )
s = fn StringWithFormat( @"%.4f\n", fn NumberFloatValue( y[i] ) )
MutableStringAppendString( mutStr, s )
else
s = fn StringWithFormat( @"%.e\t", fn NumberFloatValue( x[i] ) )
MutableStringAppendString( mutStr, s )
s = fn StringWithFormat( @"%.4e\n", fn NumberFloatValue( y[i] ) )
MutableStringAppendString( mutStr, s )
end if
next
fn StringWriteToURL( mutStr, url, YES, NSUTF8StringEncoding, NULL )
print mutStr
end fn

fn DoIt

HandleEvents```
Output:
```1       1.0000
2       1.4142
3       1.7321
1e+11   3.1623e+05
```

## Go

```package main

import (
"fmt"
"os"
)

var (
x = []float64{1, 2, 3, 1e11}
y = []float64{1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}

xprecision = 3
yprecision = 5
)

func main() {
if len(x) != len(y) {
fmt.Println("x, y different length")
return
}
f, err := os.Create("filename")
if err != nil {
fmt.Println(err)
return
}
for i := range x {
fmt.Fprintf(f, "%.*e, %.*e\n", xprecision-1, x[i], yprecision-1, y[i])
}
f.Close()
}
```

File contents:

```1.00e+00, 1.0000e+00
2.00e+00, 1.4142e+00
3.00e+00, 1.7321e+00
1.00e+11, 3.1623e+05
```

Probably not very idiomatic but oh well

```import System.IO
import Text.Printf

writeDat filename x y xprec yprec =
withFile filename WriteMode \$ \h ->
-- Haskell's printf doesn't support a precision given as an argument for some reason, so we insert it into the format manually:
let writeLine = hPrintf h \$ "%." ++ show xprec ++ "g\t%." ++ show yprec ++ "g\n" in
zipWithM_ writeLine x y
```

Example usage

```Prelude> let x = [1, 2, 3, 1e11]
Prelude> let y = map sqrt x
Prelude> y
[1.0,1.4142135623730951,1.7320508075688772,316227.7660168379]
Prelude> writeDat "sqrt.dat" x y 3 5
1.000	1.00000
2.000	1.41421
3.000	1.73205
1.000e11	316227.76602
```

Alternative solution without Printf

```import System.IO
import Numeric

writeDat filename x y xprec yprec =
withFile filename WriteMode \$ \h ->
let writeLine a b = hPutStrLn h \$ showGFloat (Just xprec) a "" ++ "\t" ++ showGFloat (Just yprec) b "" in
zipWithM_ writeLine x y
```

## HicEst

```REAL :: n=4, x(n), y(n)
CHARACTER :: outP = "Test.txt"

OPEN(FIle = outP)
x = (1, 2, 3, 1E11)
y = x ^ 0.5
DO i = 1, n
WRITE(FIle=outP, Format='F5, F10.3') x(i), y(i)
ENDDO```

Alternative: Display or Edit the formatted arrays in a spreadsheet-like dialog with a common scroll bar. The menu More - Export - File writes the formatted arrays to a file:

`DLG(Text=x, Format='i12', Edit=y, Format='F10.2', Y=0)`

## Icon and Unicon

The following works in both languages.

```link printf

procedure main()
every put(x := [], (1 to 3) | 1e11)
every put(y := [], sqrt(!x))
every fprintf(open("filename","w"),"%10.2e %10.4e\n", x[i := 1 to *x], y[i])
end
```

Contents of filename after running:

```->cat filename
1.00e0   1.0000e0
2.00e0   1.4142e0
3.00e0   1.7321e0
1.00e+11  3.1623e+5
->
```

## IDL

```; the data:
x = [1,2,3,1e11]
y=sqrt(x)
xprecision=3
yprecision=5

; NOT how one would do things in IDL, but in the spirit of the task - the output format:
form = string(xprecision,yprecision,format='("(G0.",I0.0,",1x,G0.",I0.0,")")')

; file I/O:
openw,unit,"datafile.txt",/get
for i = 1L, n_elements(x) do printf, unit, x[i-1],y[i-1],format=form
free_lun,unit
```

The file "datafile.txt" then contains the following:

```1 1
2 1.4142
3 1.7321
1E+011 3.1623E+005
```

This is fairly ugly and un-IDLish. For example one shouldn't just rely on x and y having the same size. And if data is output in human-readable form, it should probably be lined up more nicely. And if it really has to be in two-column format with x and y side by side, one might consider running ASCII_Template or some such instead of that ugly hand-formatting.

## J

```require 'files'            NB.  for fwrites

x          =.  1 2 3 1e11
y          =.  %: x        NB.  y is sqrt(x)

xprecision =.  3
yprecision =.  5

filename   =.  'whatever.txt'

data       =.  (0 j. xprecision,yprecision) ": x,.y

data fwrites filename
```

Or, more concisely:

```((0 j. 3 5) ": (,.%:) 1 2 3 1e11) fwrites 'whatever.txt' [ require 'fwrites'
```

This loses all of the inline comments and names, and instead relies on the reader's understanding of the purpose of each of the names (for example: 3 is the precision of the first column, and 5 is the precision of the second column).

Note that J's idea of precision here is "positions after the decimal point":

```   (0 j. 3 5) ": (,.%:) 1 2 3 1e11
1.000      1.00000
2.000      1.41421
3.000      1.73205
100000000000.000 316227.76602
```

## Java

```import java.io.*;

public class FloatArray {
public static void writeDat(String filename, double[] x, double[] y,
int xprecision, int yprecision)
throws IOException {
assert x.length == y.length;
PrintWriter out = new PrintWriter(filename);
for (int i = 0; i < x.length; i++)
out.printf("%."+xprecision+"g\t%."+yprecision+"g\n", x[i], y[i]);
out.close();
}

public static void main(String[] args) {
double[] x = {1, 2, 3, 1e11};
double[] y = new double[x.length];
for (int i = 0; i < x.length; i++)
y[i] = Math.sqrt(x[i]);

try {
writeDat("sqrt.dat", x, y, 3, 5);
} catch (IOException e) {
System.err.println("writeDat: exception: "+e);
}

try {
String line;
while ((line = br.readLine()) != null)
System.out.println(line);
} catch (IOException e) { }
}
}
```

## Joy

```DEFINE write-floats ==
['g 0] [formatf] enconcat map rollup
['g 0] [formatf] enconcat map swap zip
"filename" "w" fopen swap
[[fputchars] 9 fputch] step 10 fputch] step
fclose.```

Using it:

```[1.0 2.0 3.0 1e11] 3
[1.0 1.41421356 1.73205080 316227.7660168] 5
write-floats.
```

## jq

Program:

```[1, 2, 3, 1e11] as \$x
| \$x | map(sqrt) as \$y
| range(0; \$x|length) as \$i
| "\(\$x[\$i])  \(\$y[\$i])"```

Execution: To write the output to "filename":

```\$ jq -n -r -f Write_float_arrays_to_a_text_file.jq > filename
```

## Julia

```xprecision = 3
yprecision = 5
x = round.([1, 2, 3, 1e11],xprecision)
y = round.([1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791],yprecision)
writedlm("filename", [x y], '\t')
```

## Kotlin

```// version 1.1.2

import java.io.File

fun main(args: Array<String>) {
val x = doubleArrayOf(1.0, 2.0, 3.0, 1e11)
val y = doubleArrayOf(1.0, 1.4142135623730951, 1.7320508075688772, 316227.76601683791)
val xp = 3
val yp = 5
val f = "%.\${xp}g\t%.\${yp}g\n"
val writer = File("output.txt").writer()
writer.use {
for (i in 0 until x.size) {
val s = f.format(x[i], y[i])
writer.write(s)
}
}
}
```

Contents of 'output.txt':

```1.00	1.0000
2.00	1.4142
3.00	1.7321
1.00e+11	3.1623e+05
```

## Lingo

```on saveFloatLists (filename, x, y, xprecision, yprecision)
eol = numtochar(10) -- LF
fp = xtra("fileIO").new()
fp.openFile(tFile, 2)
cnt = x.count
repeat with i = 1 to cnt
the floatPrecision = xprecision
fp.writeString(string(x[i])
fp.writeString(TAB)
the floatPrecision = yprecision
fp.writeString(string(y[i])
fp.writeString(eol)
end repeat
fp.closeFile()
end```
```x = [1.0, PI, sqrt(2)]
y = [2.0, log(10), sqrt(3)]
saveFloatLists("floats.txt", x, y, 3, 5)```

## Lua

```filename = "file.txt"

x = { 1, 2, 3, 1e11 }
y = { 1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791 };
xprecision = 3;
yprecision = 5;

fstr = "%."..tostring(xprecision).."f ".."%."..tostring(yprecision).."f\n"

fp = io.open( filename, "w+" )

for i = 1, #x do
fp:write( string.format( fstr, x[i], y[i] ) )
end

io.close( fp )
```

## M2000 Interpreter

Precision here is just Round (as school rounding)

Print round(2.5,0)=3

Print round(1.5,0)=2

Print round(-2.5,0)=-3

Print round(-1.5,0)=-2

```Module Test1 (filename\$, x, xprecision, y, yprecision) {
locale 1033   // set decimal point symbol  to "."
// using: for wide output   // for UTF16LE
// here we use ANSI (8bit per character)
open filename\$ for output as #f
for i=0 to len(x)-1
print #f, format\$("{0} {1}", round(x#val(i),xprecision-1), round(y#val(i), yprecision-1))
next
close #f
}
Test1 "OutFloat.num", (1, 2, 3, 1.e11),3,  (1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791), 5```
Output:
```1 1
2 1.4142
3 1.7321
100000000000 316227.766```

## Mathematica /Wolfram Language

```exportPrec[path_, data1_, data2_, prec1_, prec2_] :=
Export[
path,
Transpose[{Map[ToString[NumberForm[#, prec2]] &, data2], Map[ToString[NumberForm[#, prec1]] &, data1]}],
"Table"
]
```

## MATLAB / Octave

```    x = [1, 2, 3, 1e11];
y = [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791];

fid = fopen('filename','w')
fprintf(fid,'%.3g\t%.5g\n',[x;y]);
fclose(fid);
```
Output:
```1	1
2	1.4142
3	1.7321
1e+11	3.1623e+05```

## Mercury

```:- module write_float_arrays.
:- interface.

:- import_module io.

:- pred main(io::di, io::uo) is det.
:- implementation.

:- import_module float, list, math, string.

main(!IO) :-
io.open_output("filename", OpenFileResult, !IO),
(
OpenFileResult = ok(File),
X = [1.0, 2.0, 3.0, 1e11],
list.foldl_corresponding(write_dat(File, 3, 5), X, map(sqrt, X), !IO),
io.close_output(File, !IO)
;
OpenFileResult = error(IO_Error),
io.stderr_stream(Stderr, !IO),
io.format(Stderr, "error: %s\n", [s(io.error_message(IO_Error))], !IO),
io.set_exit_status(1, !IO)
).

:- pred write_dat(text_output_stream::in, int::in, int::in, float::in,
float::in, io::di, io::uo) is det.

write_dat(File, XPrec, YPrec, X, Y, !IO) :-
io.format(File, "%.*g\t%.*g\n", [i(XPrec), f(X), i(YPrec), f(Y)], !IO).```

File contents:

```1              1
2              1.4142
3              1.7321
1e+11      3.1623e+05
```

## NetRexx

```/* NetRexx */

options replace format comments java crossref savelog symbols nobinary

-- Invent a target text file name based on this program's source file name
parse source . . pgmName '.nrx' .
outFile = pgmName || '.txt'

do
formatArrays(outFile, [1, 2, 3, 1e+11], [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791])
catch ex = Exception
ex.printStackTrace
end

return

-- 08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)~~
-- This function formats the input arrays.
--   It has defaults for the x & y precision values of 3 & 5
-- 08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)08:55, 27 August 2022 (UTC)~~
method formatArrays(outFile, xf = Rexx[], yf = Rexx[], xprecision = 3, yprecision = 5) -
public static signals IllegalArgumentException, FileNotFoundException, IOException

if xf.length > yf.length then signal IllegalArgumentException('Y array must be at least as long as X array')

fw = BufferedWriter(OutputStreamWriter(FileOutputStream(outFile)))

loop i_ = 0 to xf.length - 1
row = xf[i_].format(null, xprecision, null, xprecision).left(15) yf[i_].format(null, yprecision, null, yprecision)
(Writer fw).write(String row)
fw.newLine
end i_
fw.close

return
```
Output:
```1.000           1.00000
2.000           1.41421
3.000           1.73205
1.000E+11       3.16228E+5
```

## NewLISP

```; file:   write-float-array.lsp
; url:    http://rosettacode.org/wiki/Write_float_arrays_to_a_text_file
; author: oofoe 2012-01-30

; The "transpose" function is used to flip the joined lists around so
; that it's easier to iterate through them together.

(define (write-float-array x xp y yp filename)
(let ((f (format "%%-10.%dg %%-10.%dg" xp yp))
(o (open filename "write")))
(dolist (v (transpose (list x y)))
(write-line o (format f (v 0) (v 1))))
(close o)
))

; Test

(write-float-array
'(1 2 3 1e11) 3
'(1 1.4142135623730951 1.7320508075688772 316227.76601683791) 5
"filename.chan")

(println "File contents:")

(exit)
```
Output:
```File contents:
1          1
2          1.4142
3          1.7321
1e+011     3.1623e+005
```

## Nim

```import strutils, math, sequtils

const OutFileName = "floatarr2file.txt"

const
XPrecision = 3
Yprecision = 5

let a = [1.0, 2.0, 3.0, 100_000_000_000.0]
let b = [sqrt(a[0]), sqrt(a[1]), sqrt(a[2]), sqrt(a[3])]
var res = ""
for t in zip(a, b):
res.add formatFloat(t[0], ffDefault, Xprecision) & "    " &
formatFloat(t[1], ffDefault, Yprecision) & "\n"

OutFileName.writeFile res
echo res2
```
Output:
```1.00    1.0000
2.00    1.4142
3.00    1.7321
1.00e+11    3.1623e+05```

## OCaml

```let write_dat filename x y ?(xprec=3) ?(yprec=5) () =
let oc = open_out filename in
let write_line a b = Printf.fprintf oc "%.*g\t%.*g\n" xprec a yprec b in
List.iter2 write_line x y;
close_out oc
```

Example usage

```# let x = [1.0; 2.0; 3.0; 1e11];;
val x : float list = [1.; 2.; 3.; 100000000000.]
# let y = List.map sqrt x;;
val y : float list =
[1.; 1.41421356237309515; 1.73205080756887719; 316227.766016837908]
# write_dat "sqrt.dat" x y ();;
- : unit = ()
# let ic = open_in "sqrt.dat";;
val ic : in_channel = <abstr>
# try
while true do
print_endline (input_line ic)
done
with End_of_file -> ();;
1	1
2	1.4142
3	1.7321
1e+11	3.1623e+05
- : unit = ()
```

## PARI/GP

Works with: PARI/GP version 2.5.0 and above
```f(x,pr)={
Strprintf(if(x>=10^pr,
Str("%.",pr-1,"e")
,
Str("%.",pr-#Str(x\1),"f")
),x)
};
wr(x,y,xprec,yprec)={
for(i=1,#x,
write("filename",f(x[i],xprec),"\t",f(y[i],yprec))
)
};```

## Pascal

```Program WriteNumbers;

const
x: array [1..4] of double = (1, 2, 3, 1e11);
xprecision = 3;
yprecision = 5;
baseDigits = 7;

var
i: integer;
filename: text;

begin
assign (filename, 'filename');
rewrite (filename);
for i := 1 to 4 do
writeln (filename, x[i]:baseDigits+xprecision, sqrt(x[i]):baseDigits+yprecision);
close (filename);
end.
```

File contents

``` 1.00E+000 1.0000E+000
2.00E+000 1.4142E+000
3.00E+000 1.7321E+000
1.00E+011 3.1623E+005
```

## Perl

```use autodie;

sub writedat {
my (\$filename, \$x, \$y, \$xprecision, \$yprecision) = @_;

open my \$fh, ">", \$filename;

for my \$i (0 .. \$#\$x) {
printf \$fh "%.*g\t%.*g\n", \$xprecision||3, \$x->[\$i], \$yprecision||5, \$y->[\$i];
}

close \$fh;
}

my @x = (1, 2, 3, 1e11);
my @y = map sqrt, @x;

writedat("sqrt.dat", \@x, \@y);
```

File contents

```1	1
2	1.4142
3	1.7321
1e+11	3.1623e+05
```

Alternatively, with the CPAN List::MoreUtils package:

```use autodie;
use List::MoreUtils qw(each_array);

sub writedat {
my (\$filename, \$x, \$y, \$xprecision, \$yprecision) = @_;
open my \$fh, ">", \$filename;

my \$ea = each_array(@\$x, @\$y);
while ( my (\$i, \$j) = \$ea->() ) {
printf \$fh "%.*g\t%.*g\n", \$xprecision||3, \$i, \$yprecision||5, \$j;
}

close \$fh;
}

my @x = (1, 2, 3, 1e11);
my @y = map sqrt, @x;

writedat("sqrt.dat", \@x, \@y);
```

## Phix

Copy of Euphoria

```constant x = {1, 2, 3, 1e11},
y = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}

integer fn = open("filename","w")
for i=1 to length(x) do
printf(fn,"%.3g\t%.5g\n",{x[i],y[i]})
end for
close(fn)
```

File contents:

```1       1
2       1.4142
3       1.7321
1e+11   3.1623e+5
```

## PicoLisp

An exponential format like "1e11" is not supported

```(setq *Xprecision 3  *Yprecision 5)

(scl 7)
(mapc
'((X Y)
(prinl
(round X *Xprecision)
"  "
(round Y *Yprecision) ) )
(1.0 2.0 3.0)
(1.0 1.414213562 1.732050807) )```
Output:
```1.000  1.00000
2.000  1.41421
3.000  1.73205```

## PL/I

```*Process source attributes xref;
aaa: Proc Options(main);
declare X(5) float (9)  initial (1, 2, 3, 4, 5),
Y(5) float (18) initial (9, 8, 7, 6, 1e9);
declare (x_precision, y_precision) fixed binary;
Dcl out stream output;
open file(out) title('/OUT.TXT,type(text),recsize(100)');
x_precision = 9;
y_precision = 16;
put file(out) edit((X(i),Y(i) do i=1 to 5))
(skip,e(19,x_precision),
x(2),e(24,y_precision));
end;```
Output:
```  1.000000000E+0000  9.0000000000000000E+0000
2.000000000E+0000  8.0000000000000000E+0000
3.000000000E+0000  7.0000000000000000E+0000
4.000000000E+0000  6.0000000000000000E+0000
5.000000000E+0000  1.0000000000000000E+0009 ```

## PowerShell

```\$x = @(1, 2, 3, 1e11)
\$y = @(1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791)
\$xprecision = 3
\$yprecision = 5
\$arr = foreach(\$i in 0..(\$x.count-1)) {
[pscustomobject]@{x = "{0:g\$xprecision}"  -f \$x[\$i]; y = "{0:g\$yprecision}" -f \$y[\$i]}
}
(\$arr | format-table -HideTableHeaders | Out-String).Trim() > filename.txt
```

Output:

```1     1
2     1.4142
3     1.7321
1e+11 3.1623e+05
```

## PureBasic

```#Size = 4

DataSection
Data.f 1, 2, 3, 1e11 ;x values, how many values needed is determined by #Size
EndDataSection

Dim x.f(#Size - 1)
Dim y.f(#Size - 1)

Define i
For i = 0 To #Size - 1
y(i) = Sqr(x(i))
Next

Define file\$, fileID, xprecision = 3, yprecision = 5, output\$

file\$ = SaveFileRequester("Text file for float data", "xydata.txt","Text file | *.txt", 0)
If file\$
fileID = OpenFile(#PB_Any, file\$)
If fileID
For i = 0 To #Size - 1
output\$ = StrF(x(i), xprecision) + Chr(9) + StrF(y(i), yprecision)
WriteStringN(fileID, output\$)
Next
CloseFile(fileID)
EndIf
EndIf
```
Output:

to text file

```1.000	1.00000
2.000	1.41421
3.000	1.73205
99999997952.000	316227.75000```

## Python

Works with: Python version 2.6
```import itertools
def writedat(filename, x, y, xprecision=3, yprecision=5):
with open(filename,'w') as f:
for a, b in itertools.izip(x, y):
print >> f, "%.*g\t%.*g" % (xprecision, a, yprecision, b)
```

Example usage

```>>> import math
>>> x = [1, 2, 3, 1e11]
>>> y = map(math.sqrt, x)
>>> y
[1.0, 1.4142135623730951, 1.7320508075688772, 316227.76601683791]
>>> writedat("sqrt.dat", x, y)
>>> # check
...
>>> for line in open('sqrt.dat'):
...   print line,
...
1       1
2       1.4142
3       1.7321
1e+011  3.1623e+005
```
Works with: Python version 3
```def writedat(filename, x, y, xprecision=3, yprecision=5):
with open(filename,'w') as f:
for a, b in zip(x, y):
print("%.*g\t%.*g" % (xprecision, a, yprecision, b), file=f)
#or, using the new-style formatting:
#print("{1:.{0}g}\t{3:.{2}g}".format(xprecision, a, yprecision, b), file=f)
```

## R

```writexy <- function(file, x, y, xprecision=3, yprecision=3) {
fx <- formatC(x, digits=xprecision, format="g", flag="-")
fy <- formatC(y, digits=yprecision, format="g", flag="-")
dfr <- data.frame(fx, fy)
write.table(dfr, file=file, sep="\t", row.names=F, col.names=F, quote=F)
}

x <- c(1, 2, 3, 1e11)
y <- sqrt(x)
writexy("test.txt", x, y, yp=5)
```

## Racket

```#lang racket

(define xs '(1.0 2.0 3.0 1.0e11))
(define ys '(1.0 1.4142135623730951 1.7320508075688772 316227.76601683791))

(define xprecision 3)
(define yprecision 5)

(with-output-to-file "some-file" #:exists 'truncate
(λ() (for ([x xs] [y ys])
(displayln (~a (~r x #:precision xprecision)
"  "
(~r y #:precision yprecision))))))

#|
The output is not using exponenets as above, but that's not needed
since Racket can read these numbers fine:

1  1
2  1.41421
3  1.73205
100000000000  316227.76602
|#
```

## Raku

(formerly Perl 6)

### Perl 5-ish

Written in the style of the 2nd Perl 5 example.

```sub writefloat ( \$filename, @x, @y, \$x_precision = 3, \$y_precision = 5 ) {
my \$fh = open \$filename, :w;
for flat @x Z @y -> \$x, \$y {
\$fh.printf: "%.*g\t%.*g\n", \$x_precision, \$x, \$y_precision, \$y;
}
\$fh.close;
}

my @x = 1, 2, 3, 1e11;
my @y = @x.map({.sqrt});

writefloat( 'sqrt.dat', @x, @y );
```
Output:
```1	1
2	1.4142
3	1.7321
1e+11	3.1623e+05```

### Idiomatic

Written in a more idiomatic style.

```sub writefloat(\$filename, @x, @y, :\$x-precision = 3, :\$y-precision = 3) {
open(\$filename, :w).print:
join '', flat (@x».fmt("%.{\$x-precision}g") X "\t") Z (@y».fmt("%.{\$y-precision}g") X "\n");
}
my @x = 1, 2, 3, 1e11;
writefloat('sqrt.dat', @x, @x».sqrt, :y-precision(5));
```
Output:
```1	1
2	1.4142
3	1.7321
1e+11	3.1623e+05```

## Raven

```3 as \$xprecision
5 as \$yprecision

[ ] as \$results

[ 1 2 3 1e11 ] as \$a

group
\$a each sqrt
list as \$b

# generate format specifier   "%-8.3g %.5g\n"
"%%-8.%(\$xprecision)dg %%.%(\$yprecision)dg\n" as \$f

define print2 use \$v1, \$v2, \$f
\$v2 1.0 prefer  \$v1 1.0 prefer \$f format \$results push

4 each as \$i
\$f \$b \$i get \$a \$i get print2
\$results "" join "results.dat" write```
Output:

results.dat file contains:

```1        1
2        1.4142
3        1.7321
1e+11    3.1623e+05```

## REXX

```/*REXX program writes  two arrays  to a file  with a  specified (limited)  precision.   */
numeric digits 1000                              /*allow use of a huge number of digits.*/
oFID= 'filename'                                 /*name of the  output  File IDentifier.*/
x.=;  y.=;                     x.1= 1    ;    y.1=      1
x.2= 2    ;    y.2=      1.4142135623730951
x.3= 3    ;    y.3=      1.7320508075688772
x.4= 1e11 ;    y.4= 316227.76601683791
xPrecision= 3                                    /*the precision for the   X   numbers. */
yPrecision= 5                                    /* "      "      "   "    Y      "     */
do j=1  while  x.j\==''          /*process and reformat all the numbers.*/
newX=rule(x.j, xPrecision)       /*format  X  numbers with new precision*/
newY=rule(y.j, yPrecision)       /*   "    Y     "      "   "      "    */
aLine=translate(newX || left('',4) || newY,   "e",  'E')
say aLine                        /*display re─formatted numbers ──► term*/
call lineout oFID, aLine         /*write         "         "     "  disk*/
end   /*j*/
exit                                             /*stick a fork in it,  we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
rule: procedure;   parse arg z 1 oz,p;     numeric digits p;       z=format(z,,p)
parse var z  mantissa      'E'  exponent                /*get the dec dig exponent*/
parse var    mantissa int  '.'  fraction                /* "  integer and fraction*/
fraction=strip(fraction, 'T', 0) /*strip  trailing  zeroes.*/
if fraction\==''  then fraction="."fraction             /*any fractional digits ? */
if exponent\==''  then exponent="E"exponent             /*in exponential format ? */
z=int || fraction || exponent                           /*format #  (as per rules)*/
if datatype(z,'W')  then return format(oz/1,,0)         /*is it a whole number ?  */
return format(oz/1,,,3,0)      /*3 dec. digs in exponent.*/
```

output   when using the default (internal) data:

```1    1
2    1.4142
3    1.7321
1e+011    3.1623e+005
```

## Ring

```# Project : Write float arrays to a text file

decimals(13)
x = [1, 2, 3, 100000000000]
y = [1, 1.4142135623730, 1.7320508075688, 316227.76601683]
str = list(4)
fn = "C:\Ring\calmosoft\output.txt"
fp = fopen(fn,"wb")
for i = 1 to 4
str[i] = string(x[i]) + " | " + string(y[i]) + windowsnl()
fwrite(fp, str[i])
next
fclose(fp)
fp = fopen("C:\Ring\calmosoft\output.txt","r")
r = ""
while isstring(r)
r = fgetc(fp)
if r = char(10) see nl
else see r ok
end
fclose(fp)```

Output:

```1 | 1
2 | 1.4142135623730
3 | 1.7320508075688
100000000000.0000000000000 | 316227.76601683
```

## RLaB

In RLaB this task can be done in two ways:

1. Direct writing of the numerical data to the file of an array using function writem. Here the writing format is specified using the global property that is accessible through function format.

```>> x = rand(10,1); y = rand(10,1);
>> writem("mytextfile.txt", [x,y]);```

2. Converting the numerical data to text, and then writing the text to the file, using the same function writem. Here, the writing format is specified through text function, and the result is written as a plain string matrix.

```>> x = rand(10,1); y = rand(10,1);
>> s = text( [x,y], "%10.8f" );
>> writem("mytextfile.txt", s);```

Please note, writem function in RLaB can operate in two-fold fashion. RLaB keeps track of the open files that were created using the built-in function open.

If user writes the data to a file using open followed by writem then RLaB opens the file in append mode if it already hasn't been opened. If it has been, then the command open is ignored (say in batch mode). Then, each successive call to writem appends newest data to the end of the file while keeping the file open. RLaB will close the file (and OS will flush its file buffer) upon the command close.

If user writes the data to a file by using only writem then the RLaB temporarily opens the file, writes the data to it, and then closes the file. Successive calls to writem in this mode will erase the previous content of the file.

## RPL

```« { 1 2 3 1E11 } DUP √ 3 5 ""
« SWAP XPON LASTARG MANT ROT RND
IF OVER THEN "E" + SWAP + ELSE SWAP DROP END
WHILE DUP SIZE 5 ≤ REPEAT " " + END
»
→ x y xprecision yprecision filename format
« 1 x SIZE FOR j
x j GET xprecision format EVAL " " +
y j GET yprecision format EVAL +
IF j x SIZE ≠ THEN 10 CHR + END
'filename' SWAP STO+
NEXT
filename DUP 1 DISP 7 FREEZE
```
Output:
```1         1
2         1.41421
3         1.73205
1E11      3.16228E5
```

## Ruby

```# prepare test data
x = [1, 2, 3, 1e11]
y = x.collect { |xx| Math.sqrt xx }
xprecision = 3
yprecision = 5

# write the arrays
open('sqrt.dat', 'w') do |f|
x.zip(y) { |xx, yy| f.printf("%.*g\t%.*g\n", xprecision, xx, yprecision, yy) }
end

# print the result file
open('sqrt.dat', 'r') { |f| puts f.read }
```

Result:

```1       1
2       1.4142
3       1.7321
1e+11   3.1623e+05```

## Run BASIC

```x\$ = "1, 2, 3, 1e11"
y\$ = "1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791"

open "filename" for output as #f   ' Output to "filename"
for i = 1 to 4
print #f, using("##############.###",val(word\$(x\$,i,",")));"|";using("#######.#####",val(word\$(y\$,i,",")))
next i
close #f```
Output:
```             1.000|      1.00000
2.000|      1.41421
3.000|      1.73205
100000000000.000| 316227.76602```

## SAS

```data _null_;
input x y;
file "output.txt";
put x 12.3 " " y 12.5;
cards;
1      1
2      1.4142135623730951
3      1.7320508075688772
1e11   316227.76601683791
;
run;
```

## Scala

Library: Scala
```import java.io.{File, FileWriter, IOException}

object FloatArray extends App {
val x: List[Float] = List(1f, 2f, 3f, 1e11f)

def writeStringToFile(file: File, data: String, appending: Boolean = false) =
using(new FileWriter(file, appending))(_.write(data))

def using[A <: {def close() : Unit}, B](resource: A)(f: A => B): B =
try f(resource) finally resource.close()

try {
val file = new File("sqrt.dat")
using(new FileWriter(file))(writer => x.foreach(x => writer.write(f"\$x%.3g\t\${math.sqrt(x)}%.5g\n")))
} catch {
case e: IOException => println(s"Running Example failed: \${e.getMessage}")
}
}
```

## Seed7

The library math.s7i defines the function sqrt. The operators sci and exp (defined in float.s7i) support writing floating point numbers in scientific notation.

```\$ include "seed7_05.s7i";
include "float.s7i";
include "math.s7i";

const proc: main is func
local
const array float: numbers is [] (1.0, 2.0, 3.0, 1.0e11);
var float: aFloat is 0.0;
var file: aFile is STD_NULL;
begin
aFile := open("filename", "w");
for aFloat range numbers do
writeln(aFile, aFloat sci 3 exp 2 <& " " <& sqrt(aFloat) sci 5 exp 2);
end for;
close(aFile);
end func;```
Result file filename:
```1.000e+00 1.00000e+00
2.000e+00 1.41421e+00
3.000e+00 1.73205e+00
1.000e+11 3.16228e+05
```

## Sidef

Translation of: Raku
```func writedat(filename, x, y, x_precision=3, y_precision=5) {
var fh = File(filename).open_w

for a,b in (x ~Z y) {
fh.printf("%.*g\t%.*g\n", x_precision, a, y_precision, b)
}

fh.close
}

var x = [1, 2, 3, 1e11]
var y = x.map{.sqrt}

writedat('sqrt.dat', x, y)
```
Output:
```1	1
2	1.4142
3	1.7321
1e+11	3.1623e+05
```

## Smalltalk

Works with: Smalltalk/X
```x := #( 1 2 3 1e11 ).
y := x collect:#sqrt.
xprecision := 3.
yprecision := 5.

'sqrt.dat' asFilename writingFileDo:[:fileStream |
x with:y do:[:xI :yI |
'%.*g\t%.*g\n' printf:{ xprecision . xI . yprecision . yI } on:fileStream
]
]
```

obviously, with fix precisions, the following printing expression is more readable:

```'%.3g\t%.5g\n' printf:{ xI . yI } on:fileStream
```

## SPL

```x = [1, 2, 3, 10^11]
y = [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791]
xprecision = 3
yprecision = 5
> i, 1..4
s1 = #.str(x[i],"g"+xprecision)
s2 = #.str(y[i],"g"+yprecision)
#.writeline("file.txt",s1+#.tab+s2)
<```

## Standard ML

```fun writeDat (filename, x, y, xprec, yprec) = let
val os = TextIO.openOut filename
fun write_line (a, b) =
TextIO.output (os, Real.fmt (StringCvt.GEN (SOME xprec)) a ^ "\t" ^
Real.fmt (StringCvt.GEN (SOME yprec)) b ^ "\n")
in
ListPair.appEq write_line (x, y);
TextIO.closeOut os
end;
```

Example usage

```- val x = [1.0, 2.0, 3.0, 1e11];
val x = [1.0,2.0,3.0,100000000000.0] : real list
- val y = map Math.sqrt x;
val y = [1.0,1.41421356237,1.73205080757,316227.766017] : real list
- writeDat ("sqrt.dat", x, y, 3, 5);
val it = () : unit
- val is = TextIO.openIn "sqrt.dat";
val is = - : TextIO.instream
- print (TextIO.inputAll is);
1.0	1.0
2.0	1.4142
3.0	1.7321
1E11	3.1623E05
val it = () : unit
```

## Stata

```* Create the dataset
clear
mat x=1\2\3\1e11
svmat double x
ren *1 *
gen y=sqrt(x)
format %10.1g x
format %10.5g y

* Save as text file
export delim file.txt, delim(" ") novar datafmt replace
```
Output:
```1 1
2 1.4142
3 1.7321
1.0e+11 316228```

## Tcl

```set x {1 2 3 1e11}
foreach a \$x {lappend y [expr {sqrt(\$a)}]}
set fh [open sqrt.dat w]
foreach a \$x b \$y {
puts \$fh [format "%.*g\t%.*g" \$xprecision \$a \$yprecision \$b]
}
close \$fh

set fh [open sqrt.dat]
puts [read \$fh [file size sqrt.dat]]
close \$fh
```
Output:
```1	1
2	1.4142
3	1.7321
1e+011	3.1623e+005```

## VBA

```Public Sub main()
x = [{1, 2, 3, 1e11}]
y = [{1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}]
Dim TextFile As Integer
TextFile = FreeFile
Open "filename" For Output As TextFile
For i = 1 To UBound(x)
Print #TextFile, Format(x(i), "0.000E-000"), Format(y(i), "0.00000E-000")
Next i
Close TextFile
End Sub
```
Output:
```1,000E000     1,00000E000
2,000E000     1,41421E000
3,000E000     1,73205E000
1,000E011     3,16228E005
```

## V (Vlang)

 This example is incomplete. Formatting at least currently doesn't allow variables, floating point notation `g` seems to have bugs Please ensure that it meets all task requirements and remove this message.
```import os
const (
x = [1.0, 2, 3, 1e11]
y = [1.0, 1.4142135623730951, 1.7320508075688772, 316227.76601683791]

xprecision = 3
yprecision = 5
)

fn main() {
if x.len != y.len {
println("x, y different length")
return
}
mut f := os.create("filename")?
defer {
f.close()
}
for i,_ in x {
f.write_string('\${x[i]:3}, \${y[i]:1G}\n')?
}
}```
Output:
```  1, 1
2, 1.414
3, 1.732
1e+11, 316227.766
```

## Wren

Library: Wren-fmt

In the above module, 'precision' signifies the number of decimal places whereas for the purpose of this task it appears to mean the number of significant figures. We adjust for that by using a precision one less than the required figure.

In the final example, we need to force exponential format as numbers of this size would normally be printed in decimal format.

```import "io" for File
import "./fmt" for Fmt

var x = [1, 2, 3, 1e11]
var y = [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791]
var xprec = 3 - 1
var yprec = 5 - 1
File.create("filename.txt") { |file|
for (i in 0...x.count) {
var f = (i < x.count-1) ? "h" : "e"
var s  = Fmt.swrite("\$0.%(xprec)%(f)\t\$0.%(yprec)%(f)\n", x[i], y[i])
file.writeBytes(s)
}
}
```
Output:

The contents of filename.txt:

```1   	1
2   	1.4142
3   	1.7321
1e11	3.1623e05
```

## XPL0

Output is redirected to the file like this: writefloat > filename

Precision here refers to the size of the numeric field. A precision of 5 means a total of five digits, e.g: 1.2345. XPL0 translates this as one place before the decimal point and four places after it.

```include xpllib; \for Print
real X, Y;
int  N;
[X:= [1., 2., 3., 1e11];
Y:= [1., 1.4142135623730951, 1.7320508075688772, 316227.76601683791];
for N:= 0 to 3 do
Print("%1.2g\t%1.4g\n", X(N), Y(N));
]```
Output:
```1       1
2       1.4142
3       1.7321
1e11    3.1623e5
```

## Yabasic

```x\$ = "1 2 3 1e11"
pr1 = 3 : pr2 = 5

dim x\$(1)
n = token(x\$, x\$())

f = open("filename.txt", "w")

for i = 1 to n
print #f str\$(val(x\$(i)), "%1." + str\$(pr1) + "g") + "\t" + str\$(sqrt(val(x\$(i))), "%1." + str\$(pr2) + "g")
next i

close #f```

## zkl

```fcn writeFloatArraysToFile(filename, xs,xprecision, ys,yprecision){
f  :=File(filename,"w");
fmt:="%%.%dg\t%%.%dg".fmt(xprecision,yprecision).fmt;  // "%.3g\t%.5g".fmt
foreach x,y in (xs.zip(ys)){ f.writeln(fmt(x,y)); }
f.close();
}

xs,ys := T(1.0, 2.0, 3.0, 1e11), xs.apply("sqrt");
xprecision,yprecision := 3,5;
writeFloatArraysToFile("floatArray.txt", xs,xprecision, ys,yprecision);```
Output:
```\$ cat floatArray
1	1
2	1.4142
3	1.7321
1e+11	3.1623e+05
```

## ZX Spectrum Basic

The ZX Spectrum has a dedicated file format for floating point arrays. Although this format is not a text file, it would be the usual format for writing such data to a file on a ZX Spectrum. Here we write the contents of the array g() to a file:

```SAVE "myarray" DATA g()
```