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Re: improved matrix_type check
From: |
David Bateman |
Subject: |
Re: improved matrix_type check |
Date: |
Thu, 22 May 2008 14:33:53 +0200 |
User-agent: |
Thunderbird 2.0.0.12 (X11/20080306) |
Jaroslav Hajek wrote:
> I didn't mean my question as asking for them. I guessed that part of
> the reason was the fact that UMFPack et al. doesn't support single
> precision, so the linear algebra stuff would have to be done via
> conversion anyway. OTOH, single precision support available for BLAS,
> LAPACK, FFTW and libraries in libcruft.
>
Yes that is one of the major pains of trying to port single precision
types to sparse matrices/
>> It seems to me that float sparse matrices are
>> probably more useful than float matrices.
>>
>
> Why?
>
If you are using sparse matrices, one of your concerns is that you don't
have enough memory to store the dense version of the matrix... So having
single precision would allow a matrix size roughly sqrt(2) large at the
same density without having to use specialized out-of-core techniques.
Regards
David
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David Bateman address@hidden
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