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Entropy: Difference between revisions
Added uBasic/4tH version
imported>Meadpusher (→Euler Math Toolbox: Added Excel solution) |
imported>Thebeez (Added uBasic/4tH version) |
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{{out}}
<pre>1.8464393</pre>
==={{header|uBasic/4tH}}===
{{Trans|QBasic}}
uBasic/4tH is an integer BASIC only. So, fixed point arithmetic is required go fulfill this task. Some loss of precision is unavoidable.
<syntaxhighlight lang="basic">If Info("wordsize") < 64 Then Print "This program requires a 64-bit uBasic" : End
s := "1223334444"
u := ""
x := FUNC(_Fln(FUNC(_Ntof(2)))) ' calculate LN(2)
For i = 0 TO Len(s)-1
k = 0
For j = 0 TO Len(u)-1
If Peek(u, j) = Peek(s, i) Then k = 1
Next
If k = 0 THEN u = Join(u, Char (Peek (s, i)))
Next
Dim @r(Len(u) -1)
For i = 0 TO Len(u)-1
c = 0
For J = 0 TO Len(s)-1
If Peek(u, i) = Peek (s, j) Then c = c + 1
Next
q = FUNC(_Fdiv(c, Len(s)))
@r(i) = FUNC(_Fmul(q, FUNC(_Fdiv(FUNC(_Fln(q)), x))))
Next
e = 0
For i = 0 To Len(u) - 1
e = e - @r(i)
Next
Print Using "+?.####"; FUNC(_Ftoi(e))
End
_Fln Param (1) : Return (FUNC(_Ln(a@*4))/4)
_Fmul Param (2) : Return ((a@*b@)/16384)
_Fdiv Param (2) : Return ((a@*16384)/b@)
_Ntof Param (1) : Return (a@*16384)
_Ftoi Param (1) : Return ((10000*a@)/16384)
_Ln
Param (1)
Local (2)
c@=681391
If (a@<32768) Then a@=SHL(a@, 16) : c@=c@-726817
If (a@<8388608) Then a@=SHL(a@, 8) : c@=c@-363409
If (a@<134217728) Then a@=SHL(a@, 4) : c@=c@-181704
If (a@<536870912) Then a@=SHL(a@, 2) : c@=c@-90852
If (a@<1073741824) Then a@=SHL(a@, 1) : c@=c@-45426
b@=a@+SHL(a@, -1) : If (AND(b@, 2147483648)) = 0 Then a@=b@ : c@=c@-26573
b@=a@+SHL(a@, -2) : If (AND(b@, 2147483648)) = 0 Then a@=b@ : c@=c@-14624
b@=a@+SHL(a@, -3) : If (AND(b@, 2147483648)) = 0 Then a@=b@ : c@=c@-7719
b@=a@+SHL(a@, -4) : If (AND(b@, 2147483648)) = 0 Then a@=b@ : c@=c@-3973
b@=a@+SHL(a@, -5) : If (AND(b@, 2147483648)) = 0 Then a@=b@ : c@=c@-2017
b@=a@+SHL(a@, -6) : If (AND(b@, 2147483648)) = 0 Then a@=b@ : c@=c@-1016
b@=a@+SHL(a@, -7) : If (AND(b@, 2147483648)) = 0 Then a@=b@ : c@=c@-510
a@=2147483648-a@;
c@=c@-SHL(a@, -15)
Return (c@)</syntaxhighlight>
{{Out}}
<pre>1.8461
0 OK, 0:638</pre>
=={{header|BBC BASIC}}==
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