tblfromatrix

#!/usr/bin/env perl
use strict;
use warnings;
use locale;
use Getopt::Std;

# arguments
my %flags;
getopts("sth", \%flags);
my $SEP = ($ENV{'TBLSEP'} || "\t");
my ($file) = @ARGV;
if(!$file || defined($flags{'h'}))
{
  print(STDERR qq{$0 [-sth] file:
Write a three-column associative table starting from a matrix.
You can change the column separator by setting the TBLSEP environment variable.
The following command line flags are supported:

  -s:	automatic symmetric elimination
  -t:	output transposed identifiers
  -h:	help summary
});
  exit(2);
}

# settings
my $transpose = defined($flags{'t'});
my $symmetric = defined($flags{'s'});

# program
open(FD, $file) or die("cannot open $file\n");
my %matrix;

# headers
$_ = <FD>;
s/[\r\n]+$//;
my @names = split($SEP, $_, -1);
@names = splice(@names, 1);

# rows
my @rows;
my %data;
while(<FD>)
{
  s/[\r\n]+$//;
  my @line = split($SEP, $_, -1);
  push(@rows, $line[0]);
  $data{$line[0]} = [splice(@line, 1)];
}

# output
for my $i(@rows) {
  for my $j(0 .. $#names) {
    my $name = $names[$j];
    print(join($SEP, ($i, $name, $data{$i}->[$j])) . "\n");
  }
}