Maybe I'm wrong but I think you've done a Guttman-Rosler Transform here, not a Schwartzian Transform. You have combined the two values to be sorted into a single string which can be lexically sorted rather than keeping them separate and doing a sort {$a->[0] <=> $b->[0] || $a->[1] <=> $b->[1]}. From what I've read the GRT usually uses pack to combine the sort keys but sprintf looks just as effective here.

Cheers,

JohnGG

In reply to Re^2: Sorting a two-dimensional array by two columns by johngg
in thread Sorting a two-dimensional array by two columns by a11

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