[SciPy-user] Bug in io.mmread

Pearu Peterson pearu at scipy.org
Mon Nov 8 12:07:00 CST 2004



On Mon, 8 Nov 2004, Nils Wagner wrote:

> Hi all,
>
> I have some trouble when using mmread; k0.mtx is large and sparse matrix.
>
> %%MatrixMarket matrix coordinate real general
> % Generated 08-Nov-2004
> 67986 67986 4222171
> ...
>
> Traceback (most recent call last):
> File "test1.py", line 4, in ?
>   ma = io.mmread('k0.mtx')
> File "/usr/lib/python2.3/site-packages/scipy/io/mmio.py", line 208, in 
> mmread
>   a = coo_matrix(data,(row,col),M=rows,N=cols)
> File "/usr/lib/python2.3/site-packages/scipy/sparse/Sparse.py", line 1366, 
> in __init__
>   self._check()
> File "/usr/lib/python2.3/site-packages/scipy/sparse/Sparse.py", line 1376, 
> in _check
>   self.ftype = _transtabl[self.typecode]
> KeyError: 'O'
>>>>
>
> Any pointer would be appreciated.

I suspect that k0.mtx contains only integer values (some maybe larger 
that sys.maxint) and so asarray(data) returns array object with 
typecode=='O'. Could you send the file k0.mtx to me (don't send large 
files to the list) and I'll see if I can workaround this problem.

Pearu



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