[Octave-bug-tracker] [bug #56515] griddatan errors when querying with only one valid point

[Gerrit]

URL:
  <https://savannah.gnu.org/bugs/?56515>

                 Summary: griddatan errors when querying with only one valid
point
                 Project: GNU Octave
            Submitted by: gerrit0
            Submitted on: Tue 18 Jun 2019 03:13:22 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Any

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Details:

When providing only one query point, or multiple query points with only one
query point inside the generated convex hull, the call to griddatan will
fail.

Demo:


x = [ 0, 0; 1, 1; 0, 1; 1, 0 ]
y = [ 1; 2; 3; 4 ]
xi = [ .5, .5 ]
griddatan(x, y, xi)


The last line will produce the error


error: griddatan: =: nonconformant arguments (op1 is 1x1, op2 is 3x1)
error: called from
    griddatan at line 84 column 15


The patch provided by Juho in bug #45542 appears to fix this simple case, but
I haven't tested it in more complicated ones.




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