[SciPy-User] Read matrix from matrix market format file

Valène Pellissier Valene.Pellissier@cedrat....
Thu Jun 6 08:05:47 CDT 2013


I've got some problems reading a matrix  from a matrix market format file.
I have Python 3.2 and installed Numpy 1.7.1, Scipy 0.12.0 and matplotlib 1.2.1 on Windows 64.
I tried the scipy.io.mmread function but got an error I don't understand.

>>> B=scipy.io.mmread("my_matrix.mtx")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python32\lib\site-packages\scipy\io\mmio.py", line 70, in mmread
    return MMFile().read(source)
  File "C:\Python32\lib\site-packages\scipy\io\mmio.py", line 301, in read
  File "C:\Python32\lib\site-packages\scipy\io\mmio.py", line 337, in _parse_he
  File "C:\Python32\lib\site-packages\scipy\io\mmio.py", line 208, in info
    raise ValueError("Header line not of length 3: " + line)

It is a big matrix.
Is there someone who has a clue about what I'm doing wrong ?

Your help will be much appreciated.

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