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Re: requested size too large for range of Octave's index type


From: Jaroslav Hajek
Subject: Re: requested size too large for range of Octave's index type
Date: Mon, 16 Aug 2010 08:14:06 +0200

On Mon, Aug 16, 2010 at 5:35 AM, Martin Helm <address@hidden> wrote:
> Am Montag, 16. August 2010, 05:19:30 schrieb Tim Rueth:
>> I am running a simulation that uses a 6-dimensional ndgrid.  The total
>> number of elements in this matrix is 3,670,016.  Some of the elements are
>> integers, and some are floats, but I don't actually specify whether they're
>> integer or float other than saying 10, or 10.0, for example, when putting
>> numbers in them.  When I try to run this simulation, I get the following
>> error:
>>
>> "error: memory exhausted or requested size too large for range of Octave's
>> index type -- trying to return to prompt"
>>
>> I'm running Vista with 4GB of RAM.  Can someone tell me what the "range of
>> Octave's index type" is?  Should I be type-casting these elements somehow
>> so I don't waste memory?  Even for the floats, I never need more than 1
>> decimal place of accuracy.
>>
>> Thanks,
>>
>> --Tim
>
> The size of a double is 8 bytes so given your number of elements there should
> not be any problem (less than 30 MB), the 32 bit build of octave can (provided
> enough ram) handle 2e9 elements (which is 16 GB of RAM even for 32 bit).
>

This was only fixed in 3.3.50+. Previously, Octave's arrays were
limited to 2GB memory, regardless of the class. Maybe simply upgrading
would help.

> So I guess something else is wrong in what you try to do.
> Can you post the part of the code which allocates this array?
>

That would be a good idea anyway.


-- 
RNDr. Jaroslav Hajek, PhD
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz



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