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From: H on 26 Feb 2010 04:00
Is it possible to form a sparse matrix that has its non-zero values in single precision. I'm handling huge (over 100,000 x 100,000) sparse matrices and needles to say having some serious memory shortages.

I tried
>> B=single(A);
where A is sparse matrix and got the following error:

??? Error using ==> single
Attempt to convert to unimplemented sparse type

I have no idea what unimplemented sparse type means here. Anyone got a clue?

All help is greatly appreciated! (even sarcastic in-your-face ones)
From: Bruno Luong on 26 Feb 2010 04:24
"H " <mesta2000(a)hotmail.com> wrote in message <hm82j5$a0q$1(a)fred.mathworks.com>...
> Is it possible to form a sparse matrix that has its non-zero values in single precision. I'm handling huge (over 100,000 x 100,000) sparse matrices and needles to say having some serious memory shortages.
>
> I tried
> >> B=single(A);
> where A is sparse matrix and got the following error:
>
> ??? Error using ==> single
> Attempt to convert to unimplemented sparse type
>
> I have no idea what unimplemented sparse type means here. Anyone got a clue?
>

SPARSE matrix must be either DOUBLE or LOGICAL.

SINGLE-SPARSE is unimplemented (by Mathworks)

Bruno
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