[Numpy-discussion] [ANN] NumPy 0.9.6 released
mfmorss at aep.com
mfmorss at aep.com
Wed Mar 15 05:05:17 CST 2006
>matrix([[1, 0, 0],
> [0, 1, 0],
> [0, 0, 1]])
>
>
>>>>n.linalg.inverse(a)
>>>>
>>>>
>array([[ 1., 0., 0.],
> [ 0., 1., 0.],
> [ 0., 0., 1.]])
>
>I was asked to report if functions in linalg still don't honor the
>matrix input type; voila.
>
As someone who is just starting to experiment with numpy, may I ask, what
in general is the expected result of
numpy.linalg.inverse(integer_matrix)? Since not all such inverses are
integer matrices, what does it mean to "honor the matrix input type?" Is
there a matrix analogue of Python's integer scalar division?
Mark F. Morss
Principal Analyst, Market Risk
American Electric Power
Travis Oliphant
<oliphant at ee.byu.
edu> To
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Subject
03/14/2006 06:03 Re: [Numpy-discussion] [ANN] NumPy
PM 0.9.6 released
Sven Schreiber wrote:
>>>>import numpy as n
>>>>n.__version__
>>>>
>>>>
>'0.9.6'
>
>
>>>>a = n.asmatrix(n.eye(3))
>>>>a
>>>>
>>>>
>
>
Thanks, but of course a.I should work, right?
>>>>n.linalg.cholesky(a)
>>>>
>>>>
>Traceback (most recent call last):
> File "<interactive input>", line 1, in ?
> File "C:\Python24\Lib\site-packages\numpy\linalg\linalg.py", line 135,
>in cholesky_decomposition
> return transpose(triu(a,k=0)).copy()
>NameError: global name 'triu' is not defined
>
>I think I've seen this error before, was it in 0.9.4? This is a real
>show-stopper.
>
>
Thanks again, it would be nice if you could help us by checking out an
SVN version before a release ;-)
But, better late than never.
Also, show-stopper might be a bit of an over-statement. A dumb error,
yes. But, if you really depend on this, then it's a simple fix to
place a from numpy.lib import * at the top of the linalg.py file.
Thanks again for your help.
-Travis
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