[Octave-bug-tracker] [bug #47415] out of memory with factorized sparse matrix using mldivide

[Carlo de Falco]

URL:
  <http://savannah.gnu.org/bugs/?47415>

                 Summary: out of memory with factorized sparse matrix using
mldivide
                 Project: GNU Octave
            Submitted by: cdf
            Submitted on: Tue 15 Mar 2016 10:23:46 AM CET
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Hi,

The following test with a moderately large
sparse matrix results in an error on the release
branch but it works on version 3.8.1, unfortunately
I do not have the stable version at hand at the moment,
can someone check what happens there? 



>>load sparse_matrix_bug_data.binary.gz
>>[jacL, jacU, jacP, jacQ, jacR] = lu (jac);
>>delta = - jacQ * (jacU \ (jacL \ (jacP * (jacR \ res))));
error: out of memory or dimension too large for Octave's index type


the matrix that caused this is attached.
Can anyone suggest how to further debug this?


c.




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