Re: New plotting style "with parallelaxes"

[sfeam <sf...@us...>]

On Monday, 11 November 2013 08:41:50 AM pl...@pi... wrote:
> On 11/11/13 05:28, sfeam wrote:
> > Hi all,
> >
> > Please have a look at this patchset on SourceForge
> >      https://sourceforge.net/p/gnuplot/patches/646/
> >
> > or this demo output from the patched gnuplot
> >      http://gnuplot.sourceforge.net/demo_cvs/parallel.html
> >
> > Parallel axis plots are a way to explore or present correlated properties
> > of multidimensional data.  They are not so common, but that is partly
> > because not many plotting programs offer the option.   It has been a
> > requested feature in gnuplot for quite a while.
> >
> > Implementation was a bit tricky.   The obvious thing to do would be
> > to allocate new axis structures as needed so that there is no limit
> > on the number of parallel axes in the plot.  The problem is that all
> > of the macros and routines in gnuplot expect to pass or be handed
> > an index into the global axis_array[]  rather than a pointer to an
> > arbitrary axis structure.   That could be changed of course, but when
> > I started down that route it was obvious that it would require modifying
> > a very large number of lines of code.   So instead I spent some time
> > cutting down the memory impact of using static arrays, and then
> > increased the size of axis_array[] and its various parallel arrays like
> > axis_defaults[] and ticfmt[].   Currently the number of parallel axes
> > in a plot is limited to MAX_PARALLEL_AXES = MAX_NUM_VAR = 12.
> >
> > I think it's all working now, but your feedback and comments are most
> > welcome.    I wonder in particular about how to autogenerate a key or
> > other titles for this kind of plot.
> >
> > 	have fun with it,
> >
> > 		Ethan
> >
> 
> Interesting.
> 
> If people have been requesting it I suppose it's a known method of 
> presenting data. For me it's just a pretty pattern.
> 
> Maybe the demo needs a link to explaining what it is and how to read it.

There are links in the patch description on SourceForge.
The article in Wikipedia is decent:
   http://en.wikipedia.org/wiki/Parallel_coordinates

But yeah, the demo would be better if it used a real data set to illustrate
a significant feature;  it does say that in the demo text.   So contributions
of data would be welcome also.

	Ethan



> 
> Peter.
> 
> 
> 
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