[Octave-bug-tracker] [bug #45292] Strange issue with image.m and Gnuplot

[Mike Miller]

Update of bug #45292 (project octave):

                Category:   Plotting with gnuplot => Octave Function        
                Severity:              3 - Normal => 2 - Minor              
              Item Group:              Regression => Incorrect Documentation
                  Status:               Need Info => Confirmed              
                 Release:                   3.8.2 => dev                    
        Operating System:                    *BSD => Any                    

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Follow-up Comment #3:

Ok, thanks. Confirmed on Linux, dropping severity etc. Categorizing as
documentation because this seems to be about the docstring and/or warning
messages.

The image plot does show the correct axes labels for the min and max of the
supplied X and Y, so the end behavior is not incorrect, only the warning
messages may be misleading in this instance.

The image function is not expecting X and Y to be matrices. The plot will only
use the extrema of each of them as the min and max of the linear axis
labeling. Since you did not pass in a linear vector, it displays the
non-linear warning.

It could detect whether X and Y are vectors and error if they are not, instead
of trying to convert them into vectors and use them, possibly incorrectly. I
think that's more appropriate than trying to make the block work with
matrices. But wide open to suggestions as to how best to address this.

As a user what would best explain to you that it's incorrect to try to pass
the output of meshgrid into image?

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