bugGNU Octave - Bugs: bug #36493, memory exhausted when plotting...

 
 

bug #36493: memory exhausted when plotting small negative constant data with log scale

Submitter:  Carlo de Falco <cdf>
Submitted:  Fri 18 May 2012 08:51:07 PM UTC
   
 
Category:  Plotting Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Fixed Assigned to:  None
Originator Name:  Open/Closed:  * Closed
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Fri 25 May 2012 11:04:26 PM UTC, comment #3: 

You definitely found the right piece of code.  I checked in a fix here (http://hg.savannah.gnu.org/hgweb/octave/rev/e3da2a68d709) although I decided to use an if/then approach because I thought it was clearer.

Rik <rik5>
Group administrator
Fri 25 May 2012 01:12:29 PM UTC, comment #2: 

Hi,

I think the problem is around line 5931 of graphics.cc. min_val should be increased if negative and max_val decreased. Is it elegant something like

min_val *= (1-signum(min_val)/10);
max_val *= (1+signum(min_val)/10);

? Or, is it better an if-else solution?

Marco

Marco Caliari <caliari>
Group Member
Thu 24 May 2012 01:40:48 AM UTC, comment #1: 

Confirmed on a recent tip (5/23/12).  In addition I clarified in the Summary that the constant data needs to be negative.

Rik <rik5>
Group administrator
Fri 18 May 2012 08:51:07 PM UTC, original submission:  

I get the following error in the current development sources:


>> loglog (logspace (-3, 2, 100), -1e-8 * ones (1, 100))
error: memory exhausted or requested size too large for range of Octave's index type -- trying to return to prompt
>> semilogy (logspace (-3, 2, 100), -1e-8 * ones (1, 100))
error: memory exhausted or requested size too large for range of Octave's index type -- trying to return to prompt


this happens with both gnuplot and fltk backends.

c.

Carlo de Falco <cdf>
Group Member

 

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2012-05-25 rik5 StatusConfirmed Fixed
        Open/ClosedOpen Closed
    2012-05-24 rik5 StatusNone Confirmed
        Summarymemory exhausted when plotting small constat data with log scale memory exhausted when plotting small negative constant data with log scale

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