User:Coderjoe/Sandbox2: Difference between revisions
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=={{header|Nemerle}}== |
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{{trans|Python}} |
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<lang Nemerle>using System; |
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using System.Console; |
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using System.Math; |
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using Nemerle.Collections.NCollectionsExtensions; |
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module FirstClassFunc |
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{ |
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Main() : void |
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{ |
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def cube = fun (x) {x * x * x}; |
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def croot = fun (x) {Pow(x, 1.0/3.0)}; |
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def compose = fun(f, g) {fun (x) {f(g(x))}}; |
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def funcs = [Sin, Cos, cube]; |
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def ifuncs = [Asin, Acos, croot]; |
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WriteLine($[compose(f, g)(0.5) | (f, g) in ZipLazy(funcs, ifuncs)]); |
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} |
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}</lang> |
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=={{header|newLISP}}== |
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<lang newLISP>> (define (compose f g) (expand (lambda (x) (f (g x))) 'f 'g)) |
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(lambda (f g) (expand (lambda (x) (f (g x))) 'f 'g)) |
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> (define (cube x) (pow x 3)) |
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(lambda (x) (pow x 3)) |
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> (define (cube-root x) (pow x (div 1 3))) |
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(lambda (x) (pow x (div 1 3))) |
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> (define functions '(sin cos cube)) |
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(sin cos cube) |
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> (define inverses '(asin acos cube-root)) |
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(asin acos cube-root) |
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> (map (fn (f g) ((compose f g) 0.5)) functions inverses) |
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(0.5 0.5 0.5) |
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</lang> |
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=={{header|OCaml}}== |
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<lang ocaml># let cube x = x ** 3. ;; |
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val cube : float -> float = <fun> |
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# let croot x = x ** (1. /. 3.) ;; |
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val croot : float -> float = <fun> |
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# let compose f g = fun x -> f (g x) ;; (* we could have written "let compose f g x = f (g x)" but we show this for clarity *) |
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val compose : ('a -> 'b) -> ('c -> 'a) -> 'c -> 'b = <fun> |
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# let funclist = [sin; cos; cube] ;; |
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val funclist : (float -> float) list = [<fun>; <fun>; <fun>] |
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# let funclisti = [asin; acos; croot] ;; |
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val funclisti : (float -> float) list = [<fun>; <fun>; <fun>] |
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# List.map2 (fun f inversef -> (compose inversef f) 0.5) funclist funclisti ;; |
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- : float list = [0.5; 0.499999999999999889; 0.5]</lang> |
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=={{header|Octave}}== |
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<lang octave>function r = cube(x) |
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r = x.^3; |
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endfunction |
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function r = croot(x) |
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r = x.^(1/3); |
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endfunction |
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compose = @(f,g) @(x) f(g(x)); |
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f1 = {@sin, @cos, @cube}; |
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f2 = {@asin, @acos, @croot}; |
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for i = 1:3 |
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disp(compose(f1{i}, f2{i})(.5)) |
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endfor</lang> |
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=={{header|Oz}}== |
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To be executed in the REPL. |
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<lang oz>declare |
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fun {Compose F G} |
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fun {$ X} |
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{F {G X}} |
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end |
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end |
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fun {Cube X} X*X*X end |
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fun {CubeRoot X} {Number.pow X 1.0/3.0} end |
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in |
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for |
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F in [Float.sin Float.cos Cube] |
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I in [Float.asin Float.acos CubeRoot] |
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do |
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{Show {{Compose I F} 0.5}} |
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end |
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</lang> |
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=={{header|PARI/GP}}== |
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{{works with|PARI/GP|2.4.2 and above}} |
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<lang parigp>compose(f,g)={ |
<lang parigp>compose(f,g)={ |
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x -> f(g(x)) |
x -> f(g(x)) |
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<lang parigp> A=[sin, cos, x->x^2]; |
<lang parigp> A=[sin, cos, x->x^2]; |
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B=[asin, acos, x->sqrt(x)];</lang> |
B=[asin, acos, x->sqrt(x)];</lang> |
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=={{header|Perl}}== |
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<lang perl>use Math::Complex ':trig'; |
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sub compose { |
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my ($f, $g) = @_; |
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sub { |
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$f -> ($g -> (@_)); |
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}; |
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} |
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my $cube = sub { $_[0] ** (3) }; |
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my $croot = sub { $_[0] ** (1/3) }; |
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my @flist1 = ( \&Math::Complex::sin, \&Math::Complex::cos, $cube ); |
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my @flist2 = ( \&asin, \&acos, $croot ); |
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print join "\n", map { |
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compose($flist1[$_], $flist2[$_]) -> (0.5) |
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} 0..2;</lang> |
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=={{header|Perl 6}}== |
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{{works with|Rakudo|2011.06}} |
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<lang perl6>sub compose (&g, &f) { return { g f $^x } } |
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my $x = *.sin; |
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my $xi = *.asin; |
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my $y = *.cos; |
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my $yi = *.acos; |
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my $z = * ** 3; |
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my $zi = * ** (1/3); |
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my @functions = $x, $y, $z; |
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my @inverses = $xi, $yi, $zi; |
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for @functions Z @inverses { say compose($^g, $^f)(.5) }</lang> |
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Output: |
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<pre>0.5 |
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0.5 |
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0.5</pre> |
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Latest revision as of 20:38, 16 July 2011
<lang parigp>compose(f,g)={
x -> f(g(x))
};
fcf()={
my(A,B); A=[x->sin(x), x->cos(x), x->x^2]; B=[x->asin(x), x->acos(x), x->sqrt(x)]; for(i=1,#A, print(compose(A[i],B[i])(.5)) )
};</lang> Usage note: In Pari/GP 2.4.3 the vectors can be written as <lang parigp> A=[sin, cos, x->x^2];
B=[asin, acos, x->sqrt(x)];</lang>