[Octave-bug-tracker] [bug #54144] Why can't issorted() work on sparse matrices?

[Dan Sebald]

URL:
  <http://savannah.gnu.org/bugs/?54144>

                 Summary: Why can't issorted() work on sparse matrices?
                 Project: GNU Octave
            Submitted by: sebald
            Submitted on: Mon 18 Jun 2018 07:49:25 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

The issorted() documentation states


     This function does not support sparse matrices.


yet sort() works on sparse matrices:


octave:10> I = [1 1 2]; J = [1 1 2]; SV = [3 4 5];
octave:11> X = sparse (I, J, SV, 3, 4, "unique")
X =

Compressed Column Sparse (rows = 3, cols = 4, nnz = 2 [17%])

  (1, 1) ->  4
  (2, 2) ->  5

octave:12> sort(X)
ans =

Compressed Column Sparse (rows = 3, cols = 4, nnz = 2 [17%])

  (3, 1) ->  4
  (3, 2) ->  5

octave:13> issorted(sort(X))
error: issorted: needs a vector


As with the previous bug report, issorted() should be able to work on anything
that the sort() routine produces.




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