[SciPy-user] Sparse class not working

David Grant david at dwavesys.com
Tue Oct 26 14:47:59 CDT 2004

Has anyone been able to get scipy.sparse to work?  Just running the 
Sparse.py file I get the following:

Representation of a matrix:
Traceback (most recent call last):
  File "E:\My Documents\working_dir\python\mm\testSparse.py", line 26, in ?
    print repr(a)
  File "D:\Python23\Lib\site-packages\scipy\sparse\Sparse.py", line 126, 
in __repr__
    return "<%dx%d sparse matrix of type '%s' with %d stored "\
AttributeError: spmatrix instance has no attribute 'shape'

I get the same problem if I run my own test code, which looks something 
like this:

from scipy_base import *
from scipy_base.fastumath import *

import types, sys
from scipy.sparse import sparsetools, _superlu
from scipy.sparse.Sparse import *

from Numeric import *

a = spmatrix(arange(1,9),[0,1,1,2,2,3,3,4],[0,1,3,0,2,3,4,4])
print "Representation of a matrix:"
print repr(a)
print "How a matrix prints."
print a
print "Adding two matrices."
b = a+a
print b
print "Subtracting two matrices."
c = b - a
print c
print "Multiplying a sparse matrix by a dense vector."
d = a*[1,2,3,4,5]
print d
print [1,2,3,4,5]*a

If I comment out the repr(a) line which is causing the problem, b=a+a 
fails as well, because it says "AttributeError: spmatrix instance has no 
attribute 'tocsc'"

What is going on here?

David J. Grant

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