[SciPy-User] sparse array hstack
Skipper Seabold
jsseabold at gmail.com
Mon May 17 13:32:23 EDT 2010
On Thu, May 13, 2010 at 10:26 AM, Jason Rennie <jrennie at gmail.com> wrote:
> It appears that numpy.hstack doesn't work with scipy sparse arrays. I'm
> using scipy 0.6.0 (Debian stable). Am I observing correctly? Does a later
> version of numpy/scipy fix this? Or, is there code available which will do
> an hstack on sparse arrays?
> Thanks,
> Jason
You want to use scipy.sparse.hstack, which works for me with recent scipy trunk
In [20]: from scipy import sparse
In [21]: a = sparse.lil_matrix((10,10))
In [22]: a[0,0]=100
In [23]: b = sparse.lil_matrix((10,10))
In [24]: b[0,0] = 99
In [25]: c = sparse.hstack([a,b])
In [26]: c.toarray()
<snip>
Skipper
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