Re: memory exhaustive error

[Martin Helm]

Am 16.08.2012 09:24, schrieb Laurent Hoeltgen:
> Hi, Unless you really need a full matrix of that size (which I doubt), 
> I would suggest to try it with sparse matrices. On my Debian Box with 
> octave 3.2.4, I get the following: ones(25000,25000) -> fails, out of 
> memory (as expected) sparse(25000,25000) -> works like a charm. so, if 
> you have to deal with large matrices that only contain few non-zero 
> entries, use the sparse matrix type. It avoids all the hassle of 
> compiling octave with 64bit indexing. Regards, Laurent

Just again for the files:

There is absolutely no need at all to compile octave with --enable-64 on 
any 64bit linux system just to be able to work with a matrix which 
contains 625 million values (provided enough memory is available).
Just the octave needs to be new enough (3.4 or higher if my memories are 
right).

For ubuntu there seems to be a ppa to install 3.6 and that will solve that.
http://wiki.octave.org/Octave_for_GNU/Linux#Ubuntu

Of course I also suspect that a sparse matrix would do the job as well.