Re: extracting points plotted by ContourPlot
- Subject: [mg3378] Re: [mg3356] extracting points plotted by ContourPlot
- From: dschneid at knox.edu ("Dennis M. Schneider")
- Date: 2 Mar 1996 13:41:56 -0600
- Approved: usenet@wri.com
- Distribution: local
- Newsgroups: wri.mathgroup
- Organization: Wolfram Research, Inc.
- Sender: daemon at wri.com
Hi Richard: The following will do what you want. Cases[Graphics[figure], Line[x_] :> x,Infinity] Dennis M. Schneider Knox College On Thu, 29 Feb 1996, Richard Easther wrote: > > Hi! > > Can someone help me with the following problem. After doing a > > figure = ContourPlot[f[x,y], ..., Contours ->{0}], > > I want to extract the set of points actually plotted - ie a set of {x,y} > where f[x,y] == 0 for some additional processing. > > The command TextForm[InputForm[Graphics[ figure ]]] gives me a text > string which has a series of Line commands that actually contains the > {x,y} values that are plotted. > > Now what I want to know is this: can someone tell me a nice (or even > ugly but workable!) way of extracting the list(s) of points plotted by > the Line command(s)? > > If so I would be very grateful! > > Richard > > > +=================================================================+ > | Richard Easther No quote - just my address | > | easther at cfi.waseda.ac.jp | > +=================================================================+ > >