I want to compute covariance using PDL. But the problem is, it always shows an error:
Undefined subroutine &main::cov called at line 12.
Can anyone tell me where I'm making a mistake? Thanks!!
#! usr/bin/perl use strict; use warnings; use PDL; my $a = random(5, 3); my $b = random(5, 3); print "$a\n$b\n"; my $cov = cov($a, $b); #line 12 print "$cov\n";