If I read the text of your post correctly, you actually have a one-dimensional array and others have been confused by the output samples that represent LaTeX output. Here's a solution that avoids multi-dimensional arrays:

#!/usr/bin/perl
use strict;
use warnings;

sub pa { print join(', ', @_), "\n" }

die "usage: $0 <number of items> <number of columns>"
  unless $#ARGV == 1;

my @IN = 1 .. $ARGV[0];
my $COLS = $ARGV[1];
my @OUT = ();

pa @IN;

for my $i (0 .. $COLS-1) {
  for (my $j = $i; $j<=$#IN; $j+=$COLS)   
    { push @OUT, $IN[$j] }
  push @OUT, "{}"                               
}

pa @OUT;

[download]

Since you are making LaTeX output, each {} in the output marks a column break. Substitute whatever command you need to produce a column break for "{}". This should work for any number of data items and any number of columns.

Update: If you would rather have blank items as placeholders than explicit column breaks, you can change the loop to:

for my $i (0 .. $COLS-1) {
  push @OUT, @IN[map {$_*$COLS+$i} 0..($#IN/$COLS)];
}

[download]

This will leave undef elements in @OUT for each table cell that should be blank. I had initially overlooked that array slices need not be contiguous in Perl and requesting an element off the end of an array produces undef.

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

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