[Octave-bug-tracker] [bug #61782] Errors with patch and fill

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?61782>

                 Summary: Errors with patch and fill
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 09 Jan 2022 06:36:29 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  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:

Hello Octave,

For patch and fill, some error meessages are difficult to understand.

Preparation: x = rand (1, 3); y = rand (1, 3);

Correct: patch (x, y, "c");  (draws a triangle)
     or:  fill (x, y, "c");  (same figure)

Test 1: Accidentally type x instead of c in color, so type:    patch (x, y,
"x");
Expected error "x is not a valid color specification" but actual error is:

error: __go_patch__: set: invalid number of arguments, unable to create
graphics handle

which does not say what the problem was or how it should be fixed.

Test 2: Accidentally forget to say which color, so type:    patch (x, y);
Expected error "missing argument 3 (color specification)" but actual error
is:

error: varargin(3): out of bound 2 (dimensions are 1x2)

which also does not say what went wrong in the call.

Test 3: Accidentally forget to say color for fill, so type:       fill (x,
y);
Error similar to Test 2 about vargin(3) out of bound 2.

For fill (x, y, "x") making a typo in color, fill says "Invalid call to fill"
which is better than varrgin(3), though saying "invalid color" can be nicer.




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