[Perldl] PDL t_linear / Matrix transformation questions

[Ben]

Hi,

I am trying to use t-linear to transform a "collection" of points. What would be
the right way of doing that? As an example, let's say I want to stretch all
coordinates in $a by a factor of 3: 


#!/usr/bin/perl

use PDL;            
use PDL::Matrix;
use PDL::Transform;

$a = mzeroes(2,1, 10);
  for ($i = 0; $i < 10; $i++) {
    $a->set(0,0,$i,$i);
    $a->set(1,0,$i,$i);
  }     
print $a;

$f = t_linear(s=>3);
$d= $a->apply($f);

print $d;

This code doesn't work, gives an error
PDL: Dim mismatch in matmult of [2x2] x [2x1]: 2 != 1 

(Why?)

However, if I were to change the line $a = mzeroes(2,1, 10); to $a =
mzeroes(2,2, 10); it gives me an answer, but I've just added unnecessary entries
to my collection of points.

Thanks


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