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Re: Memory exhausted when using \


From: Mathieu Dubois
Subject: Re: Memory exhausted when using \
Date: Mon, 16 Jul 2012 15:13:21 +0200
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Le 16/07/2012 15:04, marco atzeri a écrit :
On 7/16/2012 2:55 PM, Markus Bergholz wrote:
like that?

octave:1> A=[246 710, 49 260]
A =

    246   710    49   260

octave:2> B=[49 260, 1]
B =

     49   260     1

octave:3> A \ B
ans =

    1.8994e-02   1.0079e-01   3.8764e-04
    5.4820e-02   2.9088e-01   1.1188e-03
    3.7834e-03   2.0075e-02   7.7212e-05
    2.0075e-02   1.0652e-01   4.0970e-04

octave:4>

or am i wrong?
but updating octave and use an up to date version is always a good idea!

regards
markus


On Mon, Jul 16, 2012 at 2:43 PM, Mathieu Dubois
 wrote:
Hello,

I was porting some code from Matlab to Octave but I'm facing a "memory
exhausted" error. I'm using Octave 3.2 on a i386 system (I may have access to more powerful systems but I would like to be able to run the code on this
machine).

This happens when using "\" to solve a linear system. The matrix A is (246
710, 49 260) and b is (49 260, 1).

I have seen that Octave have other solvers for linear system. Do you think
that may help?
Do you have any idea if upgrading to 3.6 could help?

Thanks in advance,
Mathieu

I suspect he means a matrix with dimension 246710 x 49260
a vector with 49260 x 1

As the matrix is almost 10 Gb no surprise of memory exhausted

Regards
Marco
You're right Marco I mean a 246710 x 49260 matrix (I wrote the size of the matrix).

The construction of A and b works because they are sparse. It's the division that don't work.




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