[Octave-bug-tracker] [bug #48873] Matlab incompatibilities in plot routines revealed through dump_plot_demos

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?48873>

                 Summary: Matlab incompatibilities in plot routines revealed
through dump_plot_demos
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Tue 23 Aug 2016 10:23:09 AM PDT
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

All testing was done with cset 22366:837df5db5710.  After running the
dump_plot_demos script and comparing this to results obtained under Matlab
(http://josoansi.de/octave_plot_compare) I've found the following problems.


demo imshow 8
 ## Indexed color shows correctly onscreen, but does not print correctly to
png.
 ## Seems like an issue with gl2ps

demo light 8
 ## Test of 'light' objects with the "backlit" property is different
 ## Need to redo the algorithms for "backlit"

demo material 2
 ## Plot appears correctly onscreen, but when printed the mesh lines are
black.
 ## Seems like an issue with gl2ps

demo patch 6
 ## Hidden lines are showing through when printing
 ## Seems like an issue with gl2ps

demo patch 7
 ## Hidden lines are showing through when printing
 ## Seems like an issue with gl2ps

demo plotmatrix 1
 ## Matlab chooses to hide the xlabels and ylabels of subplots in the 3x3
 ## array in order to better show the data.  Also, for the subplots with 
 ## histograms the axis tick marks are disabled.  See plotmatrix.m

demo plotyy 3
 ## I don't know whether this is really a valid use case, but trying to
 ## use 'hold on' with plotyy is running into problems with the ColorOrder
 ## property and creating different results from Matlab.

demo rose 1
 ## The plot is reversed left-to-right.  The maximum value under Octave
occurs
 ## at theta=0, whereas it is theta=180 for Matlab.  Have we got the
algorithm
 ## reversed in rose.m?

scatter
 ## Lots of these demos are different from the ones with Matlab.  It looks
like
 ## the sizing of markers for scatter needs to be re-done completely.
 ## See scatter.m








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