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Interesting problem...
Since it's that time of year...

q(May all your Christmases be white.) =~ s/Christmase/loop/r =~ s/whit +e/implicit/r

Inspired by mention of "sliding".

#!/usr/bin/perl use strict; # https://theweeklychallenge.org/blog/perl-weekly-challeng +e-248/#TASK2 use warnings; use List::AllUtils qw( zip_by reduce ); use Data::Dump qw( pp ); sub slide { my @new; reduce { push @new, $a + $b; $b } @_; @new; } for ( [ [1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12] ], [ [1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1] ], ) { print 'Input: $a = ', pp($_), "\n"; my @new = zip_by { [ @_ ] } map [ slide @$_ ], zip_by { [ @_ ] } map [ slide @$_ ], @$_; print 'Output: $b = ', pp(\@new), "\n\n"; }

Outputs

Input: $a = [[1 .. 4], [5 .. 8], [9 .. 12]] Output: $b = [[14, 18, 22], [30, 34, 38]] Input: $a = [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]] Output: $b = [[2, 1, 0], [1, 2, 1], [0, 1, 2]]

In reply to Re: Fast sliding submatrix sums with PDL (inspired by PWC 248 task 2) by tybalt89
in thread Fast sliding submatrix sums with PDL (inspired by PWC 248 task 2) by Anonymous Monk

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