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| how large matrix can smatrixevdi or smatrixevd handle http://forum.alglib.net/viewtopic.php?f=2&t=251 |
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| Author: | juliustch [ Thu Jan 20, 2011 7:17 pm ] |
| Post subject: | how large matrix can smatrixevdi or smatrixevd handle |
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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| Author: | Sergey.Bochkanov [ Fri Jan 21, 2011 9:48 am ] |
| Post subject: | Re: how large matrix can smatrixevdi or smatrixevd handle |
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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| Author: | juliustch [ Fri Jan 21, 2011 7:01 pm ] |
| Post subject: | Re: how large matrix can smatrixevdi or smatrixevd handle |
So how much memory do you expect to use for 10000 * 10000 matrix? |
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| Author: | Sergey.Bochkanov [ Fri Jan 21, 2011 7:34 pm ] |
| Post subject: | Re: how large matrix can smatrixevdi or smatrixevd handle |
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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