I'm assuming you want a PDL with the value of  sqrt( 1/( 0.5 + 0.02*$x**2 )*cos($x) + 1/( 0.5 + 0.02*$y**2 )*cos($y) ) for x and y intervals of 0 to 10, stepping by 1.

The closest thing I've seen is things similar to the example in the synopsis of PDL::Graphics::TriD::Contours.

Here is a lightly modified version with your function: 
use PDL;
use strict;
use warnings;

use constant X_NPOINTS => 11;
use constant Y_NPOINTS => 11;

my $proto = zeroes( X_NPOINTS, Y_NPOINTS );
my $x = $proto->xvals;
my $y = $proto->yvals;

my $z = sqrt( 1/(0.5 + 0.02*$x**2)*cos($x)
            + 1/(0.5 + 0.02*$y**2)*cos($y) );

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Update: Fixed broken link

In reply to Re: I need a liddle piddle advice by plobsing
in thread I need a liddle piddle advice by GrandFather

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