def diagsvd(s, M, N):
 part = diag(s)
 typ = part.dtype.char
 MorN = len(s)
 if (MorN == M):
  return r_[('-1', part, zeros((M, (N - M)), typ))]
 elif (MorN == N):
  return r_[(part, zeros(((M - N), N), typ))]
 else:
  raise ValueError('Length of s must be M or N.')

def diagsvd ( s , M , N ) : part = diag ( s ) typ = part . dtype . char MorN = len ( s ) if ( MorN == M ) : return r_ [ ( '-1' , part , zeros ( ( M , ( N - M ) ) , typ ) ) ] elif ( MorN == N ) : return r_ [ ( part , zeros ( ( ( M - N ) , N ) , typ ) ) ] else : raise ValueError ( 'Length of s must be M or N.' )
construct the sigma matrix in svd from singular values and size m .