Do you know where your variables are?  
PerlMonks 
Re: problem with complex matrix multiplication using PDLby cordbin (Friar) 
on Oct 06, 2012 at 06:07 UTC ( #997583=note: print w/replies, xml )  Need Help?? 
Have you tried to compute the determinant of your matrix ?
A square matrix has an inverse if and only if its determinant is not zero.
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