[Octave-bug-tracker] [bug #64696] Failure to load sparse matrix with no nonzero elements from text file saved by Octave

[John W. Eaton]

URL:
  <https://savannah.gnu.org/bugs/?64696>

                 Summary: Failure to load sparse matrix with no nonzero
elements from text file saved by Octave
                   Group: GNU Octave
               Submitter: jwe
               Submitted: Tue 19 Sep 2023 05:30:44 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 8.3.0
         Discussion Lock: Any
        Operating System: Any
           Fixed Release: None
         Planned Release: 8.4.0 (current stable)


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Follow-up Comments:


-------------------------------------------------------
Date: Tue 19 Sep 2023 05:30:44 PM UTC By: John W. Eaton <jwe>
I see the following behavior with 8.3.0:


octave:1> version
ans = 8.3.0
octave:2> x = y = sparse (1, 2);
octave:3> save tmp.dat x y
octave:4> fileread ("tmp.dat")
ans = # Created by Octave 8.3.0, Tue Sep 19 13:02:42 2023 EDT <jwe@devtty>
# name: x
# type: sparse matrix
# nnz: 0
# rows: 1
# columns: 2


# name: y
# type: sparse matrix
# nnz: 0
# rows: 1
# columns: 2



octave:5> load tmp.dat
error: invalid sparse matrix: element 1: Symbols '#' is not an integer format


I will commit a fix with an explanation of why the problem happens after I
have a bug report number.







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