[SciPy-User] Matrix indexing and updating
Luca Manini
manini.luca@tiscali...
Mon Nov 1 05:43:53 CDT 2010
>>>>> "Emanuele" == Emanuele Olivetti <emanuele@relativita.com> writes:
Emanuele> Hi Luca, If I understand you problem correctly, maybe
Emanuele> this example can help you:
It helps a little, but:
1) you are using numpy.ndarray instead of scipy.matrix. I have
not grasped the difference yet, apart for the annoying fact
that a 1xN matrix is not a vector and still has two indices
(and that makes the code less "explicit").
For exmple:
In [58]: import scipy
In [59]: v = scipy.matrix(range(5))
In [60]: v
Out[60]: matrix([[0, 1, 2, 3, 4]])
In [61]: for x in v:
....: print x
....:
[[0 1 2 3 4]]
In [62]:
In [63]: z = v.tolist()[0]
In [64]: z
Out[64]: [0, 1, 2, 3, 4]
In [65]: for x in z:
....: print x
....:
....:
0
1
2
3
4
2) you set the submatrix values to 1, but what I need is to "add"
to the submatrix the values that come from an (equal sized)
matrix.
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