How To Get The Difference From Two Arrays?

[pythonboy]

How to get the difference from two arrays?

Any arrays string,int,float ... bla bla

You will have to write your own procedures?If so would you guys please share here?

Thank you

[ewerybody]

question is: What do you exactly want to do?
And how do two of your arrays look for example?

What do you mean with difference?

[joojaa]

difference for a array is not defined. It could be anything really, it could reefer to the difference between the sums, inverse polish notation stack operation of some kind, element elimination by similliarity.....

Wich is why theres no automatically commend syntax for these kinds of stuffs in most languages, because it can mean many things. Its like asking for a honest politician (they do exist but you cant separate them form the rest).

But i assume you mean difference by element in 2 arrays.

its ratther easy.

CODE
proc float[] fArrayElemDif(float $array1[],float $array2[]){
float $arrayOut[];
$a=size($array1);
for ($i=0;$i<$a;$i++){

  $arrayOut[$i]=$array1[$i]-$array2[$i];
}
return $arrayOut;
}

mel cant overload so you must make a version for each type

to test run

fArrayElemDif({1.0,2,3,4},{5.5,6,7,8})

However this is potentially a out of mel scope programming target.

[pythonboy]

Sorry folks

I should have been more clear.

Difference in elements. For example :

A = {1,2,3} B = {2} difference is 1 and 3

A = {"Jooja","ewerybody"} B = {"ewerybody"} difference is Jooja

and so on ...

Thanks

[ewerybody]

for a stringArray you can use:
stringArrayRemove

its described in the maya docs as well!
And its a simple mel script.

just remove one array from the other and you should have the difference!

[rustomji]

// This procedure will report the difference or silimarities between two string arrays
//
// Arguements:
// string $array_01 is the first array
// string $array_02 is the second array
// int $returnType value of 0 returns an inclusive list of members, a value of 1 returns an exclusive list of members

global proc string[] stringArrayDiff(string $array_01[], string $array_02[], int $returnType)
{
string $largeArray[];
string $smallArray[];

string $keepArray[];
string $killArray[];	
string $returnArray[];

if((size($array\_01)) > (size($array\_02)))
{
	$largeArray = $array\_01;
	$smallArray = $array\_02;		
}
else
{
	$largeArray = $array\_02;
	$smallArray = $array\_01;		
}

for($i=0; $i < size($largeArray); $i++)
{
	int $ifFound = 0;

	for($strItemSmall in $smallArray)
	{
		if($strItemSmall == $largeArray[$i])
		{
			$ifFound = 1;
			$keepArray = stringArrayCatenate({$largeArray[$i]}, $keepArray);				
			break;
		}
	}
	if($ifFound == 0)
	{
		$killArray = stringArrayCatenate({$largeArray[$i]}, $killArray);
	}
}

if($returnType == 0)
{
	$returnArray = $keepArray;
}
else
{
	$returnArray = $killArray;
}
return $returnArray;

}

[pythonboy]

Your script works with strings only ... Somone has a procedure that works for all?

[visualfx]

take the logic from the procedure posted by Rustomji and rewrite it as python.
you can't do this in mel, input arguments can only be of the type specified in the procedure definition...python is much more fleible in this respect.

[joojaa]

no but you an have many procedures. Thet ere identical in all other respects. Anwyay string array diff is builtin to maya!