Trying to squeeze that last drop out, eh? :)

This probably is not as efficient as it gets, but you can always get rid of temp vars by replacing one of your for loops with a map: 

foreach my $k (keys %columns) {
  $columns{$k} = [ map { $columns{$k}->[$_] } @si ]
}

[download]
Ok, it looks nicer . . . let's check some benchmarks...

UPDATE!!!
use jmcnamara's solution - it's faster: 

Benchmark: timing 30000 iterations of clintp, jeffa, jmcnamara...
 clintp:     5 wallclock secs ( 4.29 usr +  0.10 sys =  4.39 CPU) @ 6833.71/s (n=30000)
 jeffa:      3 wallclock secs ( 3.12 usr +  0.01 sys =  3.13 CPU) @ 9584.66/s (n=30000)
 jmcnamara:  2 wallclock secs ( 2.18 usr +  0.01 sys =  2.19 CPU) @ 13698.63/s (n=30000)

jeffa

In reply to (jeffa) Re: Structure slogging: do my homework! :) by jeffa
in thread Structure slogging: do my homework! :) by clintp

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