Compare 2 1D arrays (with a same size) quickly

[ashly]

i would like to ask if there's any way to compare 2 1D arrays quickly rather than using for-next loop to compare them one by one?

thanks.

[water]

It depends on the result you need. If you just want to know if they are equal then you could use function _ArrayToString and compare the resulting strings.

[UEZ]

You must compare each element from each array otherwise you can't be sure whether both are equal or not!

If the array is sorted than it is much easier to compare, otherwise you need to sort both arrays and compare it afterwards.

Br,

UEZ

[Myicq]

What is "compare" ?

Take

A    A
B    C
C    B

They are DIFFERENT because the order is not the same.

They are IDENTICAL because the content is the same

my ideas would be

case 1) make a string and compare it

case 2) sort and compare - OR add together values of ascii codes and compare total number. (like: 2+3 = 3+2 = 5)

[czardas]

I wrote you a small function.

Global $array1[3] = [1,2,3], $array2[3] = [1,3,2]

If _ArrayCompare($array1, $array2) Then
    MsgBox(0, "", "Arrays are identical")
Else
    MsgBox(0, "", "Arrays are different")
EndIf

Func _ArrayCompare($aArray1, $aArray2)
    If Ubound($aArray1, 0) <> 1 Or Ubound($aArray2, 0) <> 1 Or Ubound($aArray1, 1) <> Ubound($aArray2, 1) Then Return SetError (1, 0, False)

    Local $iBound = UBound($aArray1)
    For $i = 0 To $iBound -1
        If Not ($aArray1[$i] == $aArray2[$i]) Then Return SetError(2, 0, False) ; No more comparisons needed.
    Next
    Return True
EndFunc

I had a small oversight. - Fixed.

Edited November 29, 2012 by czardas