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Out of memory error

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nilsotto
nilsotto 2016-2-25
关闭： MATLAB Answer Bot 2021-8-20
Hi, When I'm trying to multiply a [112880x10] matrix with another matrix of [10x125000], I get an error message "Out of memory". Is there a way of getting around this problem (using special algorithms or similar)?

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Andreas Goser
Andreas Goser 2016-2-25
One double has 2 bytes.
So the 112880x10 matrix has 2257600 bytes. Fine 10x125000 -> 2500000 bytes. Also Fine
But multiplying should give a 112880x125000 matrix! That is 2.8220e+10 bytes == 26 Gigabytes! Nut sure if this works, but is definitely a challenge. Maybe you are happy with singles too? Also I assume you have a 64 Bit MATLAB on 64 bit OS? You might want to test with slightly smaller matrices where the limit is.
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nilsotto
nilsotto 2016-2-25
I was thinking about triangularization or something similar?!
Walter Roberson
Walter Roberson 2016-2-25
Triangularization does not reduce the amount of memory required for the final matrix, and that is your problem rather than "working memory" to do the calculation in.

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