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 Post subject: how large matrix can smatrixevdi or smatrixevd handle
PostPosted: Thu Jan 20, 2011 7:17 pm 
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Hi, I am using smatrixevd to solve eigenvalues for a large matrix (10000 * 10000). But it reported aborted core dump. I wonder how large this algorithm can handle. Thank you very much.


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 Post subject: Re: how large matrix can smatrixevdi or smatrixevd handle
PostPosted: Fri Jan 21, 2011 9:48 am 
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Joined: Fri May 07, 2010 7:06 am
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Several thousands by several thousands is possible, but 10000x10000 is too large. It is 100 000 000 elements, 800 megabytes, and function allocates several copies of array as temporaries. I suppose that you used it on 32-bit system, so it was unable to allocate enough memory.


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 Post subject: Re: how large matrix can smatrixevdi or smatrixevd handle
PostPosted: Fri Jan 21, 2011 7:01 pm 
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So how much memory do you expect to use for 10000 * 10000 matrix?


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 Post subject: Re: how large matrix can smatrixevdi or smatrixevd handle
PostPosted: Fri Jan 21, 2011 7:34 pm 
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If you don't need eigenvectors - then 1600 Mbytes (2x800, one for a original matrix, one for a copy). 3200 Mbytes - if you need eigenvectors.


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