Like this?: 

#! perl -slw
use strict;
use Data::Dump qw[ pp ];

my @data = map[ split ' ' ], <DATA>;
pp \@data;
my @xformed;

push @xformed, [ map shift @$_ // (), @data ] while @{ $data[ 0 ] };

pp \@xformed;

__DATA__
1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16

[download]

Output:

C:\test>1157088.pl
[[1, 5, 9, 13], [2, 6, 10, 14], [3, 7, 11, 15], [4, 8, 12, 16]]

[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]]

[download]
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority". I knew I was on the right track :)
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: How to warp an array by trading X/Y coordinates (rows/columns) by BrowserUk
in thread How to warp an array by trading X/Y coordinates (rows/columns) by Polyglot

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