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perlperl-modulepdl

Importing matrix from text file to PDL

Rather than creating the matrix using PDL, I would like to know ways to use existing matrix in TAB delimited file in PDL.
I wish to perform math operations on that matrix.
I tried math operations on randomly created matrix in situ but I have no idea if it is possible to import matrix from text files.

use PDL;
$a = zeroes 5,5;
$b = xvals $a;
print $b;

Here , 5X5 matrix with zeros was created for trial. I would be interested in external matrix not this one.

Solution

  • Use PDL::IO::Misc::rcols:

    Input data:

    1   2   3   4   5
6   7   8   9   10

    code:

    use PDL;

my $x = rcols( 'foo.dat', [] );

print $x;

    Result:

    % perl foo.pl

[
 [ 1  6]
 [ 2  7]
 [ 3  8]
 [ 4  9]
 [ 5 10]
]