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And here's a WxH version. It's interesting what can be found in List::AllUtils...

#!/usr/bin/perl use strict; # https://theweeklychallenge.org/blog/perl-weekly-challeng +e-248/#TASK2 use warnings; use List::AllUtils qw( sum zip_by reductions ); use Data::Dump qw( pp ); sub nslide # size, elements { my @q = splice @_, 0, shift; return reductions { push @q, $b; $a + $b - shift @q } sum(@q), @_; } my ($width, $height) = (2, 2); 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 [ nslide $height, @$_ ], zip_by { [ @_ ] } map [ nslide $width, @$_ ], @$_; print 'Output: $b = ', pp(\@new), "\n\n"; }

In reply to Re^2: 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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