Re: [Pysparse-developers] Compiling pysparse for Windows

[Roman G. <rom...@gm...>]

Hi Dominique

Thanks for the explanation.

Maybe it would be feasible to store off-diagonal elements twice (above 
and below the diagonal) when extracting a submatrix from a symmetric 
matrix.

Regards,
Roman

On 27.01.2010 00:42, Dominique Orban wrote:
> On Tue, Jan 26, 2010 at 9:28 PM, Roman Geus<rom...@gm...>  wrote:
>    
>> Hello
>>
>> Triggered by a recent email on the pysparse-users list I tried to
>> compile pysparse 1.1 for Windows and Python 2.6.
>>
>> I used Visual C++ (Express Edition) and the latest ACML for BLAS and
>> LAPACK (both are available for free).
>>
>> Except for the superlu package (which I skipped) only a few changes to
>> the source code were necessary (mostly due to the lack of C99 support in
>> the MS C compiler) to build the modules.
>>
>> Unfortunately one of the unit tests in spmatrix_test failed, but
>> basically it seemed to work. (Later I saw that the same unit test also
>> fails on Linux, so it might be a general problem.)
>>
>> I have two questions:
>>
>> Do you know of anybody who has successfully built pysparse using Visual
>> C++ recently?
>>
>> Do you think it would be desirable to be able to build using Visual C++
>> or is build process using MinGW straight-forward and sufficient?
>>
>> Best regards,
>> Roman
>>      
> I will let Windows users comment on what would best suit their needs.
> In the meantime I commented out the test that fails. The reason is
> that when I implemented fancy indexing (which includes slicing), I
> decided that taking a slice on a matrix would result by default in a
> non-symmetric matrix, even if the original matrix was symmetric.
> Clearly, only symmetric slices would yield a symmetric submatrix
> (although special cases may occur but would be costly to check for).
> Currently, Pysparse doesn't check for symmetric slices.
>
>