I have a numpy sparse matrix A1 of type
scipy.sparse.dok.dok_matrix
with integer values. I'm trying to use it to subset another integer matrix A2 of type
numpy.matrixlib.defmatrix.matrix
by
A2[A1>0]
Both of them have shape (1,10000). Although it works well to use
A1[A1>0]
I get the following error:
>> A2[A1>0]
Traceback (most recent call last):
File "<ipython-input-250-19959d659dc5>", line 1, in <module>
edge_counts[nodes>0]
File "//anaconda/lib/python2.7/site-packages/numpy/matrixlib/defmatrix.py", line 284, in __getitem__
out = N.ndarray.__getitem__(self, index)
IndexError: only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices
IndexError
is telling that A1 > 0
is not an object compatible with indexing.
You can investigate easily with:
In []: type(A1 > 0)
Out[]: scipy.sparse.csr.csr_matrix
And you can turn in to a bool
array by converting A1 to an array first, using toarray()
:
In []: type(A1.toarray() > 0)
Out[]: numpy.ndarray
Then A2[A1.toarray() > 0]
should work just fine.