[Octave-bug-tracker] [bug #66513] Two sparse matrix issues on indexing and rank

[Liang Tang]

URL:
  <https://savannah.gnu.org/bugs/?66513>

                 Summary: Two sparse matrix issues on indexing and rank
                   Group: GNU Octave
               Submitter: lt1234
               Submitted: Tue 03 Dec 2024 02:00:36 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: lt1234
        Originator Email:
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 9.2.0
        Operating System: Microsoft Windows
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


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Date: Tue 03 Dec 2024 02:00:36 AM UTC By: Liang Tang <lt1234>
Since there are some on-going efforts to fix issues of sparse matrix, I would
like to submit two small issues as a batch in this report.  Thanks.  

Issue 1 - indexing (9.2.0)

a=sparse(randi(1, 30,30)); a(31:+1:60,31:+1:60)=a;  whos a
a=full(  randi(1, 30,30)); a(60:-1:31,60:-1:31)=a;  whos a
a=sparse(randi(1, 30,30)); a(60:-1:31,60:-1:31)=a;  % failed 

error: =: nonconformant arguments (op1 is 30x30, op2 is 30x29)

Issue 2 - rank does not work for sparse.  Should have been an error message.
(9.2.0)

a=sparse(30,30); a(1:30, 1:29)=sparse(randi(1, 30,29)); 
display([sprank(a), rank(a)])

   29    1

Issue 3 - Load file error already fixed in 9.2.  Failed in 8.2 
a=spalloc(3,3); save -V7 a.mat a; load a.mat;    









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