<commit_before>function mps(s)
# create minimum-phase spectrum sm from complex spectrum s
   return exp( fft( fold( ifft( log( clipdb(s,-100) )))));
end
<commit_msg>forcing spectrum to be complex<commit_after>function mps(s)
# create minimum-phase spectrum sm from complex spectrum s
   return exp( fft( fold( ifft( log( clipdb(complex(s),-100) )))));
end

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