[SciPy-user] Converting matrices from pysparse
Nils Wagner
nwagner at iam.uni-stuttgart.de
Fri Jun 29 08:16:17 EDT 2007
Hi all,
Just now I have installed pysparse via
http://people.web.psi.ch/geus/pyfemax/download.html.
It works fine for me !
Is it possible to convert matrices from the pysparse specific format
into a format such
that I can visualize them with pylab.spy ?
>>> type(A)
<type 'sss_mat'>
>>>
>>> from pylab import spy, show
>>> spy(A)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "/usr/lib64/python2.4/site-packages/matplotlib/pylab.py", line
2281, in spy
ret = gca().spy(*args, **kwargs)
File "/usr/lib64/python2.4/site-packages/matplotlib/axes.py", line
5089, in spy
nr, nc = Z.shape
ValueError: need more than 0 values to unpack
I have used the following example from the website
from pysparse import itsolvers, poisson, precon, jdsym
A = poisson.poisson2d_sym(200).to_sss()
K = precon.ssor(A)
k_conv, lmbd, Q, it, it_inner = \
jdsym.jdsym(A, None, K, 5, 0.0, 1e-10, 150, itsolvers.qmrs, clvl=1)
Nils
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