[Numpy-discussion] Singular Matrix problem with Matplitlib in Numpy (Windows - AMD64)

John Hunter jdh2358@gmail....
Fri Jan 16 08:16:18 CST 2009


Andrew, since you are the original author of the isnan port, could you
patch the branch and the trunk to take care of this?

JDH

On Fri, Jan 16, 2009 at 8:07 AM, George <gwg@emss.co.za> wrote:
> Hello.
>
> I am terribly sorry. I was mistaken last night. I had the latest Matplotlib
> version 0.98.5.2 and I thought the bug was fixed but it hasn't. Let me explain.
>
> In the file MPL_isnan.h line 26 there is a declaration:
>
> typedef long int                             MPL_Int64
>
> This is fine for Linux 64-bit, but NOT for Windows XP 64-bit! For Windows the
> declaration should be:
>
> typedef long long                            MPL_Int64
>
> This bug has caused me a LOT of late nights and last night was one of them. The
> declaration is correct for Linux 64-bit and I guess Matplotlib was developed on
> Linux because of this declaration. That is also why I thought the bug was fixed
> but this morning I realised that I was looking at the wrong console.
>
> So, in summary. For Matplotlib 0.98.5.2 and Numpy 1.2.1 to work without any
> problems. This means compiling and using Numpy and Matplotlib on Windows XP
> 64-bit using AMD 64-bit compile environment, change line 26 in the file
> MPL_isnan.h from long int to long long.\
>
> I also previously suggested switching MKL and ACML etc. but with this change
> everything is fine. One can choose any math library and it works.
>
> Writing a small test application using sizeof on different platforms highlights
> the problem.
>
> Thanks.
>
> George.
>
>
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