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Re: isodensity contours [message #75266 is a reply to message #75265]

Wed, 23 February 2011 17:30

Gray
Messages: 253
Registered: February 2010

Senior Member

On Feb 23, 1:39 pm, David Fanning <n...@idlcoyote.com> wrote:
> Gray writes:
>> I have a scatterplot with a bunch of points on it. I'd like to plot
>> isodensity contours to include 99%, 90%, 75%, and 50% of my points.
>> How do I set up my data to give to cgContour? Thanks!
>
> The simple answer is, you set up your data the way
> you *always* set up your data!
>
> Don't you really want to know, how do I choose
> some percentage of my points? And, that question
> we can't answer, because you haven't indicated
> what the criteria are going to be. I guess
> you will have to decide. Randomly, distance
> from the centroid, based on height above surface,
> etc. Lot's of possibilities here.
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

David -

When I actually try to plot the contour, it doesn't work. My x and y
inputs to cgContour are xb and yb:
IDL> print, minmax(xb), minmax(yb)
5.92672 20.6767
-9.38564 7.11436

Why does the contour plot out in space? http://tinypic.com/r/2viio7l/7

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[Message index]

		Re: isodensity contours By: David Fanning on Wed, 23 February 2011 18:02
		Re: isodensity contours By: Gray on Wed, 23 February 2011 17:48
		Re: isodensity contours By: David Fanning on Wed, 23 February 2011 17:43
		Re: isodensity contours By: Gray on Wed, 23 February 2011 17:30
		Re: isodensity contours By: Gray on Wed, 23 February 2011 16:34
		Re: isodensity contours By: Gray on Wed, 23 February 2011 13:25
		Re: isodensity contours By: Jeremy Bailin on Wed, 23 February 2011 12:04
		Re: isodensity contours By: pgrigis on Wed, 23 February 2011 12:24
		Re: isodensity contours By: Gray on Wed, 23 February 2011 12:06
		Re: isodensity contours By: pgrigis on Wed, 23 February 2011 11:12
		Re: isodensity contours By: David Fanning on Wed, 23 February 2011 10:39
		Re: isodensity contours By: pgrigis on Thu, 24 February 2011 08:28

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