Math functions

[mikehunt114]

Functions for calculating factorials and binomial coefficients (aka choose):

Func _MathFactorial($number)
    If Not IsNumber($number) Then
        Return 0
        SetError(1)
    EndIf
    Local $value = 1
    For $i = 1 To $number
        $value *= $i
    Next
    Return $value
EndFunc

Func _MathChoose($num1, $num2)      ;Important: $num1 choose $num2
    If Not IsNumber($num1) And Not IsNumber($num2) Then
        Return 0
        SetError(1)
    EndIf
    If $num2 < 0 Or $num2 > $num1 Then Return 0
    Local $num1_Factorial = _MathFactorial($num1)
    Local $num2_Factorial = _MathFactorial($num2)
    Local $diff_Factorial = _MathFactorial($num1 - $num2)
    Local $value = $num1_Factorial/($num2_Factorial*$diff_Factorial)
    Return $value   
EndFunc

Edit: Added restraints for _MathChoose

Edited July 18, 2007 by mikehunt114