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Can I multiply corresponding numbers in two arrays together?

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Contributed by Anonymous Monk on Nov 29, 2000 at 07:23 UTC
Q&A  > arrays


Description:

I want to multiply the first terms of the arrays with each other, and the two second terms with each other, etc.

Answer: Can I multiply corresponding numbers in two arrays together?
contributed by Fang

You could use List::MoreUtils:

use List::MoreUtils qw/pairwise/; @a = (1..5); @b = (6..10); @x = pairwise { $a * $b } @a, @b; print join ", ", @x; __END__ 6, 14, 24, 36, 50

Be sure to check both array have the same number of elements, or you could get a trail of zeroes:

use List::MoreUtils qw/pairwise/; @a = (1..5); @b = (6..8); @x = pairwise { $a * $b } @a, @b; print join ", ", @x; __END__ 6, 14, 24, 0, 0
Answer: Can I multiply corresponding numbers in two arrays together?
contributed by Russ

I hate to use array indices, but here's one way:

my @Products = map {$Arr1[$_] * $Arr2[$_]} 0..$#Arr1;
This assumes that the arrays @Arr1 and @Arr2 exist and are the same length.

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