[bug #67977] demos that plot anything should have a relevant title

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Follow-up Comment #6, bug #67977 (group octave):

The m-files to review are in the directory *TOP_SRCDIR/scripts/plot/* and in
the subdirectories of *appearance/*, *draw/*, *util/*.

Some good examples are in *rose.m*.  The function documentation shows several
ways to call the function:

 -- rose (THETA)
 -- rose (THETA, NBINS)
 -- rose (THETA, BINS)

And the *%!demo* blocks demonstrate using the different calling syntaxes.  The
*title()* command explains what the demo block is showing. 

%!demo
%! clf;
%! rose (2*randn (1e5, 1), 8);
%! title ("rose() angular histogram plot with 8 bins");

%!demo
%! clf;
%! rose ([2*randn(1e5, 1), pi + 2*randn(1e5, 1)]);
%! title ("rose() angular histogram plot with 2 data series");

%!demo
%! clf;
%! rose ([0, 2, 3, 5], [0, pi/2, pi, 3*pi/2]);
%! title ("rose() angular histogram plot with specified bins");

Using *grep* it is easy to find the m-files which have *%!demo* blocks.  After
that, it will require some inspection to see if they are missing a *title()*
command.




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