[Octave-bug-tracker] [bug #42116] "out of memory or dimension too large" regression going from 3.6.3 to 3.8.1

[Paul Jakma]

URL:
  <http://savannah.gnu.org/bugs/?42116>

                 Summary: "out of memory or dimension too large" regression
going from 3.6.3 to 3.8.1
                 Project: GNU Octave
            Submitted by: paul
            Submitted on: Mon 14 Apr 2014 14:44:31 BST
                Category: None
                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: 3.8.1
        Operating System: GNU/Linux

    _______________________________________________________

Details:

I'm working with 64k × 64k sparse matrices. In 3.6.3 I was able to manipulate
and plot these in ways which now sometimes cause errors in 3.8.1. E.g.:

> spy(asgraphs{1}.adj)
error: out of memory or dimension too large for Octave's index type

If I run  numel(nonzeros(..)) on my smaller and larger graphs I get   83226
and 324616. Both these graphs I can 'spy' in 3.6.3. With 3.8.1 however, even
the smaller gives the above error.

Further information, requested on #octave:

3.6.3:
octave 1> y=speye(50000); numel(y)
ans = -1.7950e+09
octave:2> octave_config_info.USE_64_BIT_IDX_T
ans = false

3.8.1:
octave:1> y=speye(50000); numel(y)
error: out of memory or dimension too large for Octave's index type
octave:1> octave_config_info.USE_64_BIT_IDX_T
ans = no







    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?42116>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/