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use warnings;
use strict;
...
use PDL;

print index('hello world', 'lo w'), "\n";

Argument "hello world" isn't numeric in subroutine entry at try.pl lin
+e 7.
Argument "lo w" isn't numeric in subroutine entry at try.pl line 7.
0

PDL includes about a dozen perl modules that form the core of the
language, plus additional modules that add further functionality. The
perl module "PDL" loads all of the core modules automatically, making
their functions available in the current perl namespace.

Exports
"use PDL;" exports a large number of routines into the calling
namespace. If you want to avoid namespace pollution, you must
instead "use PDL::Lite", and include any additional modules
explicitly.