[Octave-bug-tracker] [bug #63277] isfinite returns full array in Matlab for sparse input

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?63277>

                 Summary: isfinite returns full array in Matlab for sparse
input
                 Project: GNU Octave
               Submitter: rik5
               Submitted: Wed 26 Oct 2022 05:17:46 PM PDT
                Category: Octave Function
                Severity: 2 - Minor
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any


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Follow-up Comments:


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Date: Wed 26 Oct 2022 05:17:46 PM PDT By: Rik <rik5>
In changeset 800eb86438cc a modification was made to avoid using isfinite() on
sparse input.  I'm not sure what problem that was addressing, but it did lead
me to find a difference between Octave and Matlab.

Sample code:

MATLAB


x = sparse ([Inf, 1; 2 NaN]);
isfinite (x)
ans = 2x2 logical array
1 0
1. 1


Octave


ans =

Compressed Column Sparse (rows = 2, cols = 2, nnz = 2 [50%])

  (2, 1) -> 1
  (1, 2) -> 1


I don't know if we want to follow Matlab or not.  It seems like this is
inconsistent with isinf() and isnan() functions which do return a sparse
output for sparse input in Matlab.  Octave is arguably being correct here by
keeping that pattern.







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