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MathGroup Archive 1991

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Re: Data Help

  • To: mathgroup at yoda.ncsa.uiuc.edu
  • Subject: Re: Data Help
  • From: "Charles W. Fletcher" <cwf at lakisis.umd.edu>
  • Date: Tue, 12 Feb 91 11:13:37 EST

I assume that you are using something like

		Plot[F[x],{x,a,b}]

and you want to obtain the associated data (ascii) file of x-y
values that were plotted. These data are in a list in the graphics.
You may see it by using

		FullForm[Plot[...]]

To get at the list you need to find it position and use the double
bracket [[ ]] to separate it (See docs on lists of lists and on
expressions.)

Thus if

		u = Plot[F[x]...]

then (if I remember correctly)

		u[[1,1,1,1,1]]

is the list of data. This varies from plot type to plot type,
so you may need to play around. For example, if

		u = Plot3D[...]

then
		u[[1]]

is the list of data. If you have problems, contact me and I'll pull
out some of my old notebooks were I did this. 

One other thing, I talked to one of the WRI people and he (Kevin 
McIssac) noted the following. Due to the algorithm M. uses to plot
the data values (ie, the x-values) may NOT (ie, are most likely not)
evenly spaced. If this is what you want, okay. If not, you should use
Table[] to generate the data.

Good luck,
Charlie


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