[bug #54144] issorted("rows") support for sparse matrix input

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Update of bug #54144 (group octave):

                 Summary: Why can't issorted() work on sparse matrices? =>
issorted("rows") support for sparse matrix input

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Follow-up Comment #4:

I think the documentation needs to be clarified that *issorted* does not work
for sparse matrices if the *"rows"* argument is present.

Example code:

issorted (sparse ([1 2 3]), "rows")
error: issorted: sparse matrices not yet supported


I made a small change to the documentation to note that.

Re-titling bug report to be about remaining issue.

Note, the Matlab function is quite different than Octave's and has support for
multi-dimensional arrays as well as a dimension input argument.  We could also
mark this as a compatibility issue and try to add those features.



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