MathGroup Archive 2000

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Getting values from Plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg22666] Re: Getting values from Plot
  • From: "Kevin J. McCann" <kevin.mccann at jhuapl.edu>
  • Date: Sat, 18 Mar 2000 01:27:43 -0500 (EST)
  • Organization: Johns Hopkins University Applied Physics Lab, Laurel, MD, USA
  • References: <8aqqt7$a4o@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Note that the actual part of the plot p1[[1,3,1,1]] below depends on the
options used in the plot. If you just go with a barebones plot use
p1[[1,1,1,1]] instead.  Should have looked before I posted.

Kevin


First post:

There may be other ways, but here is one. The trick is to remember that
everything is a Mathematica expression, e.g.


p1 = Plot[Sin[x], {x, 0, 2*Pi}];

Generates a plot, now to look at the Mathematica expression type

p1//FullForm

and you will see more than you probably wanted, but you may recognize some
things in there.  Now try

p1[[1]]

You will see a few Graphics directives and Line[{lots of points}]. This is
what you want. To make this story short type

pts = p1[[1,3,1,1]]

and you will have a list of the points that Mathematica used to generate the plot.
You can show them with:

ListPlot[pts, PlotJoined -> False];





  • Prev by Date: Re: running a program in batch
  • Next by Date: Re: Mathlink two way communication
  • Previous by thread: Re: Getting values from Plot
  • Next by thread: Re: Getting values from Plot