[Octave-bug-tracker] [bug #61199] Input validation for nchoosek

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?61199>

                 Summary: Input validation for nchoosek
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 21 Sep 2021 08:51:51 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Other
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.3.0
         Discussion Lock: Any
        Operating System: Any

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Details:

The nchoosek function currently does not accept character vectors (strings)
though that is perfectly valid mathematically. To achieve that requires only
one line of input validation to be changed:

Change this:

  if (nargin != 2
      || ! (isreal (k) && isscalar (k))
      || ! (isnumeric (v) && isvector (v)))
    print_usage ();
  endif


to this, removing "isnumeric(v)":

  if (nargin != 2
      || ! (isreal (k) && isscalar (k))
      || ! isvector (v))
    print_usage ();
  endif


Then this can be achieved:

octave:7> nchoosek ('A':'E', 3)
ans =
ABC
ABD
ABE
ACD
ACE
ADE
BCD
BCE
BDE
CDE






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