Re: Extract a contour from a 3-D plot.
- To: mathgroup@smc.vnet.net
- Subject: [mg11416] Re: [mg11292] Extract a contour from a 3-D plot.
- From: jpk@max.mpae.gwdg.de
- Date: Thu, 12 Mar 1998 01:32:22 -0500
> From farr@brown.edu Wed Mar 4 11:04:18 1998
> Date: Wed, 4 Mar 1998 01:39:44 -0500
> From: "Chris Farr" <farr@brown.edu>
To: mathgroup@smc.vnet.net
> To: mathgroup@smc.vnet.net
> Subject: [mg11416] [mg11292] Extract a contour from a 3-D plot.
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>
> I would like to extract a contour from a 3-D plot.
>
> I am particularly interested in the contour associated with a value of =
> zero. That is, the curve generated when I set the option in
> ContourPlot = to Contours->{0}.
>
> How can I extract this contour ( I guess the contour would be a =
> collection of XY coordinates) ? What if there are two contours with a
> = value of zero? How can I extract both of them? Thanks in advance.
>
> Chris Farr
>
>
>
Hi Chris,
at first ContourGraphics[] store the height field of the computed
function values. To get the lines and polygons You must convert it to a
Graphics[] object explicit.
The first argument of the Graphics[] object store the graphics
primitives and a converted contour plot contains Line[] and Polygon[]
objects. If You select all Line[] objects, the arguments are the
coordinates of the contour lines.
Hope that helps
Jens