[LON-CAPA-dev] Future Directions Ideas: gnuplot
Wed, 09 May 2007 20:32:47 +0200
I was trying to implement a problem requiring the display of a contour
plot. After realizing that contour plots (set contour; splot ...)
possibly are not part of loncapa's subset of gnuplot I found myself
confirmed by Phil's and Guy's discussion. I would like to add the
following to it:
Wouldn't it be easier to make a slim xml-structure allowing access to
all of gnuplot's functionality? I think that this will be happily used
by people who are familiar with gnuplot (or have time to make themselves
By slim xml-structure I mean something like
$myfunction = "sin(&random(1,5,1)*x)";
set xlabel "t"; plot [-4:4] [-3:3] $myfunction
where the shellcommand-tag can contain ANY valid gnuplot command.
Gnuplot is far too powerful to have a detailed xml-structure in loncapa.
Imagine the authoring of a perl-script blocks would require a detailed
Guy Albertelli II wrote:
> Hi Phil,
>>* upgrade gnuplot to version 4.2 (currently using 4.0)
>>* 3 dimensional graphing, both in wire grid and surface form
>>* arrows and vector fields given data
>>* RGB and hex color options for individual portions of graphs (bug 874)
>>* new features of gnuplot that solve existing LON-CAPA bugs
>> * symbols and sub/superscript in graph labels (bugs 2135 and 3994)
>> * implement line thickness (bug 4794)
>> * implement new graph tic options (bug 2201)
>>* multiple plots on a single graph
> Hmm, though that this works aready. At least I can add multiple curves
> to 1 gnuplot object...
>>* support polar and cylindrical graphing
> Isn't Polar is fully supported?
>>* parametric functions
>>* fitting curves to data
>>In order to add a good chunk of this without overbloating the current XML
>>structure used by authors to create plots, I am working on a more detailed
>>document detailing a proposed new XML schema to incorporate these new
>>features in a coherant manner for both XML authors and colorful-editor
> Well I generally argue in favor of evolution rather than revolution.
> This it might be better to try to add in some of the features rather
> than trying to design a complete revamp?
> And as for direction I guess I'd start with trying to satisfy the
> filed bugs first. And see how that goes.
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