On my PC, 2e3 x 2e3 matrices:

$transposed[ $i ++ ] .= chop while $_ (incorrect): 0.6s

$transposed[ $i ++ ] .= chop while length (correct) (by pryrt): 0.75s

$transposed[ $i ++ ] .= chop while /./ (assuming that dot match any input char): 1.35s

$transposed[ $i ++ ] .= chop while !/^$/: 1.35s

next are without reverse:

$transposed[ $i ++ ] .= $& while /./g: 1.85s

$transposed[ $i ++ ] .= substr $_, 0, 1, '' while length: 1.0s

$transposed[ $i ++ ] .= $_ for split //: 1.0s

push @out, join '', map substr( $_,$i,1 ), @in (by BrowserUK): 1.1s

(pryrt's substr+substr variant ommited)

In reply to Re^2: How to transpose lines faster? by rsFalse
in thread How to transpose lines faster? by rsFalse

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