[Numpy-discussion] Problem with numpy.linalg.inv in numpy 1.01b on Mac OS X 10.4 Tiger (8.7.0)

David M. Cooke cookedm at physics.mcmaster.ca
Thu Aug 10 13:22:36 CDT 2006


On Thu, 10 Aug 2006 07:33:44 -0600 (MDT)
"Daran L. Rife" <drife at ucar.edu> wrote:

> Hello,
> 
> I am a veteran user of Numeric and am trying
> out the latest version of numpy (numpy 1.01b)
> on Mac OS X 10.4 Tiger (8.7.0).
> 
> When trying to invert a matrix with
> numpy.linalg.inv I get the following error:
> 
> ---->
> 
> Traceback (most recent call last):
>   File "./bias_correction.py", line 381, in ?
>     if __name__ == "__main__": main()
>   File "./bias_correction.py", line 373, in main
>     (index_to_stnid, bias_and_innov) = calc_bias_and_innov(cf, stn_info,
> obs, infile_obs, grids, infile_grids)
>   File "./bias_correction.py", line 297, in calc_bias_and_innov
>     K = make_kalman_gain(R, P_local, H)
>   File "./bias_correction.py", line 157, in make_kalman_gain
>     K = MA.dot( MA.dot(P, MA.transpose(H)), inv(MA.dot(H, MA.dot(P,
> MA.transpose(H))) + R ) )
>   File "/opt/python/lib/python2.4/site-packages/numpy/linalg/linalg.py",
> line 149, in inv
>     return wrap(solve(a, identity(a.shape[0], dtype=a.dtype)))
> TypeError: __array_wrap__() takes exactly 3 arguments (2 given)
> 
> <----
> 
> Is this a known problem, and if so, what is the fix?

It looks like the problem is that numpy.core.ma.MaskedArray.__array_map__
expects a "context" argument, but none gets passed. I'm not familiar with
that, so I don't know what the fix is ...

-- 
|>|\/|<
/--------------------------------------------------------------------------\
|David M. Cooke                      http://arbutus.physics.mcmaster.ca/dmc/
|cookedm at physics.mcmaster.ca




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