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print "   result: ", $matrixM x $matrixX_assigned_value;

PDL: Dim mismatch in matmult of [2x2] x [2x1]: 2 != 1

print "should be: ", $matrixB_assigned_value;
print "   result: ", $matrixX_assigned_value x $matrixM;

should be:
[
...
  [ 4 -5]
 ]
]