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Re: How to extract data from an analytical summation equation?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86485] Re: How to extract data from an analytical summation equation?
  • From: dh <dh at metrohm.ch>
  • Date: Wed, 12 Mar 2008 00:14:20 -0500 (EST)
  • References: <fr5dur$o4j$1@smc.vnet.net>


Hi Jinglei,

Questions can be answered better if you give a bit more info.

What you can do is to extract data from the graphics. Assume you are 

using CountourPlot like:

g=ContourPlot[x^2+y^2/3==1,{x,-1,1},{y,-1,1}]

now everything you want is in g, but we need to extract it. In this case 

you may say:

points=g[[1]]/.GraphicsComplex[pts_,__]->pts ;

ListPlot[points]

this gives you the points of the plot.

hope this helps, Daniel



Jinglei Yang wrote:

> Dear all,

> 

> I have a complex equation and can plot a curve when setting the variable range.

> The question is: how to extract the data set at a certain interval so I can

> replot it in other software?

> 

> Thank you so much.

> 

> Jinglei @ UIUC




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