Re: New plotting style "with parallelaxes"

[<pl...@pi...>]

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.

Peter.