Hi, Relevant code might work with matlab, but pdl has a different look while constructing matrices.
First you write dimension of columns, then rows, which is reverse of matlab and octave.
forexample, sequence(4,3) create a 3 x 4 matrix which should be confusing for a matlab user.

#!/usr/bin/perl
use PDL;
use PDL::Matrix;
$a =   sequence(2,3); 
$b =   sequence(3,3);

$z= $a x $b;
print $z;
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Error in inner:Wrong dims
Insert below snippet before $x = A x B x C x D;

print $A->getdim(0); #column
print $A->getdim(1); #row
....and for the rest matrices
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May be you got confused of matrices of pdl. Cheers