There's an easier way to create your $Sqs matrix. I tried this with your example and the suggestion by ambrus about matrix multiplication, and it worked. 
$Sqs = zeroes($V);
$Sqs->diagonal(0,1) .= $S;

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In reply to Re: Arrgghh! Perl and Matlab (round 2) by tall_man
in thread Arrgghh! Perl and Matlab (round 2) by Angharad

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