Sparse Matrix Failure

sparse_error.py

#! /usr/bin/env python
"""
Author: Jeremy M. Stober
Program: ERROR.PY
Date: Thursday, August  2 2012
Description: Example of how sparse matrix operations may fail.
"""



import numpy as np
import scipy.sparse as sp
A = np.ones((3,4))
np.multiply(A, A[0]) # arrays are ok
B = np.asmatrix(A)
np.multiply(B, B[0]) # matrices are ok
C = sp.csc_matrix(A)
np.multiply(C, C[0]) # sparse matrix fails
C.multiply(C[0])     # sparse matrix fails