bugGNU Octave - Bugs: bug #40357, OOM when converting from sparse...


bug #40357: OOM when converting from sparse double to sparse logical

Submitter:  David Spies <dspyz>
Submitted:  Wed 23 Oct 2013 06:43:22 PM UTC
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Need Info Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * dev Operating System:  * GNU/Linux
Fixed Release:  None Planned Release:  None
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Thu 11 Nov 2021 09:29:13 PM UTC, comment #3: 

behavior is still present in Octave 6.4.0.  not certain if it's a duplicate, if internally it's the indexing causing the the 'full' expansion and OOM event, or if it's something else regarding the type change. Note that changing y to also be logical, then:

x = logical(sparse(100000,100000));
y = logical(sparse(100000,100000));
i = full(logical(sprand(100000,1,0.3)));
x(i,:) = y(i,:);

results in no memory issues. (although perhaps octave is just being efficient resulting in it sidestepping an indexing problem when the types are the same?).  perhaps there's a better test to determine if this is a duplicate of the indexing issue, or something else.

Nicholas Jankowski <nrjank>
Group Member
Fri 25 Nov 2016 09:46:40 PM UTC, comment #2: 

I think this might be a DUPLICATE of bug #40341 (Logical indexing into sparse matrices causes OOM).

It is also already mentioned as an open todo for the Octave sparse matrix implementation: http://wiki.octave.org/Projects#Sparse_Matrices (Sparse logical indexing...)

Hartmut <hardy>
Tue 22 Nov 2016 10:37:45 PM UTC, comment #1: 

This behavior is still present in Octave 4.2.0.

Hartmut <hardy>
Wed 23 Oct 2013 06:43:22 PM UTC, original submission:  

>> x = logical(sparse(100000,100000));
>> y = sparse(100000,100000);
>> i = full(logical(sprand(100000,1,0.3)));
>> x(i,:) = y(i,:);

error: out of memory or dimension too large for Octave's index type

David Spies <dspyz>


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-11-11 nrjank StatusConfirmed Need Info
    2014-01-19 mtmiller StatusNone Confirmed

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