bugGNU Octave - Bugs: bug #32090, Save in MATLAB data format

 
 

bug #32090: Save in MATLAB data format

Submitter:  Guillaume <gyom>
Submitted:  Mon 10 Jan 2011 04:02:56 PM UTC
   
 
Category:  None Severity:  5 - Blocker
Priority:  5 - Normal Item Group:  Segfault, Bus Error, etc.
Status:  Need Info Assigned to:  dbateman
Originator Name:  Guillaume Open/Closed:  * Closed
Release:  * dev Operating System:  * GNU/Linux
Fixed Release:  None Planned Release:  None
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Mon 17 Jan 2011 01:52:45 PM UTC, comment #7: 

It works for me as well, thanks David!

Guillaume <gyom>
Sun 16 Jan 2011 09:47:54 PM UTC, comment #6: 

Ok so it appears to work fine.. Closing this bug

D.

David Bateman <dbateman>
Group Member
Fri 14 Jan 2011 07:28:31 AM UTC, comment #5: 

With Matlab 7.10.0.499 (R2010a) 32-bit (glnx86) and Doug's file from comment 4 I get

>> load a.mat
>> whos

  Name         Size               Bytes  Class     Attributes

  a         1000x1000            123488  double    sparse   
  b         1000x1000            123524  double    sparse   

Søren

Søren Hauberg <hauberg>
Fri 14 Jan 2011 12:28:40 AM UTC, comment #4: 


Hi David

I don't have Matlab but I did make the file with a new tip.
the file is here:
http://ubuntuone.com/p/YCs/

If some one would try this with Matlab and report here then all will be happy
Doug Stewart

Doug Stewart <dastew>
Thu 13 Jan 2011 09:52:21 PM UTC, comment #3: 

I'm not sure this is a blocker as the case of nnz not being equal to nzmax should be relatively rare in practice. However the changeset

http://hg.savannah.gnu.org/hgweb/octave/rev/da8e32c99969

seems to do the right thing for me.. Could some one, with a freshly checked and built octave run

a = sprand(1000,1000,0.01);
b = sprandn(1000,1000,0.01);
save -v6 a.mat a b

and then try and load the saved file in matlab? I'll keep this report open till I have that feedback.

D.

David Bateman <dbateman>
Group Member
Wed 12 Jan 2011 07:44:46 AM UTC, comment #2: 

Running

a = spalloc (2,2,4); s(1,1) = 1; s(2,2) = 2;
b = 1;
save -v6 a.mat a b

gives me the attached file.

(file #22394)

Søren Hauberg <hauberg>
Tue 11 Jan 2011 10:36:40 PM UTC, comment #1: 

I think I see the issue. Octave recently changed so that you could create a sparse matrix and then fill it without reallocating memory at each assignment, and as a result removed the assumption that nnz = nzmax in octave. Changes were made in a number of places to handle this change, but the matlab file format in this case was unclear from the documentation and I made a guess on how matlab treated the case of nnz not equaling nzmax (as I no longer have access to matlab) it appears that this guess was wrong.

The simpler example

a = spalloc (2,2,4); s(1,1) = 1; s(2,2) = 2;
b = 1;
save -v6 a.mat a b

demonstrates this error more easily.. To make my life easier could you run the above in matlab and upload the saved file so I can compare what matlab does in this case.

D.

David Bateman <dbateman>
Group Member
Mon 10 Jan 2011 04:02:56 PM UTC, original submission:  

This is a follow-up from previous bug report:
  https://savannah.gnu.org/bugs/?31942

The attached a.mat MATLAB v5 MAT-file was created with MATLAB.
The following crashes with Octave dev:

  octave> load a.mat
  octave> save a.mat a -v6
  octave> load a.mat
  error: load: invalid element type = 58368

while it seems to work with Octave 3.2.4.

Guillaume <gyom>

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:
   
   
Comment:
   

Attached Files
file #22394:  a.mat added by hauberg (288B - application/octet-stream)
file #22386:  a.mat added by gyom (90KiB - application/octet-stream)

 

Depends on the following items: None found

Items that depend on this one: None found

 

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    Follow 6 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2011-01-16 dbateman Open/ClosedOpen Closed
    2011-01-12 hauberg Attached File- Added a.mat, #22394
    2011-01-12 jwe Severity3 - Normal 5 - Blocker
    2011-01-11 dbateman StatusNone Need Info
        Assigned toNone dbateman
    2011-01-10 gyom Attached File- Added a.mat, #22386

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