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And here's a WxH version

Excellent. And here a slope for you to slide, sort of in splendid isolation, from a plot fanatic:

sub sms_WxH_Perl_sliding_tybalt89 ( $m, $width, $height ) { my @new = zip_by { [ @_ ] } map [ nslide $height, @$_ ], zip_by { [ @_ ] } map [ nslide $width, @$_ ], @$m; return \@new } __END__ Time (s) vs. N (NxN submatrix, 1500x1500 matrix) +-----------------------------------------------------------+ 1.8 |-+ + + + + + + + + +-| | A | | A | 1.6 |-+ +-| | A | | | 1.4 |-+ +-| | A | | | 1.2 |-+ A +-| | | | A | | A | 1 |-+ +-| | A | | | 0.8 |-+ A +-| | | | A | 0.6 |-+ A +-| | A | | | 0.4 |-+ A +-| | A | | A | 0.2 |-+ +-| | A | | + + + + + + + + | 0 +-----------------------------------------------------------+ 0 200 400 600 800 1000 1200 1400 sms_WxH_Perl_sliding_tybalt89 A +------+-------+ | N | A | +------+-------+ | 2 | 1.700 | | 10 | 1.725 | | 100 | 1.538 | | 200 | 1.387 | | 300 | 1.259 | | 400 | 1.131 | | 500 | 1.016 | | 600 | 0.894 | | 700 | 0.784 | | 800 | 0.678 | | 900 | 0.578 | | 1000 | 0.484 | | 1100 | 0.394 | | 1200 | 0.309 | | 1300 | 0.231 | | 1400 | 0.153 | +------+-------+

In reply to Re^3: Fast sliding submatrix sums with PDL (inspired by PWC 248 task 2) by Anonymous Monk
in thread Fast sliding submatrix sums with PDL (inspired by PWC 248 task 2) by Anonymous Monk

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