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Re: How to obtain contour data through contour command? [message #86262 is a reply to message #86259]

Tue, 22 October 2013 06:14

Mats Löfdahl
Messages: 263
Registered: January 2012

Senior Member

On 2013-10-22 14:12, jacobsvensmark@gmail.com wrote:
> So I have regularly gridded f(x,y) values, and I wish to know for which x,y I have f(x,y)=k. I imagine this is exactly what the contour command does, though I don't believe it can only plot the curve, not output the curve in an array.

The array indices are easy to find:

IDL> f = [[1, 2, 3], [2, 3, 2]]
IDL> print, f
1 2 3
2 3 2
IDL> print, array_indices(f, where(f eq 2))
1 0
0 1
2 1

If the x and y coordinates are different from the grid indices you will
need to use the indices to get them. How that is done depends on how
those coordinates are specified.

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[Message index]

		How to obtain contour data through contour command? By: jacobsvensmark on Tue, 22 October 2013 05:12
		Re: How to obtain contour data through contour command? By: Mats Löfdahl on Tue, 22 October 2013 06:14
		Re: How to obtain contour data through contour command? By: David Fanning on Tue, 22 October 2013 06:32
		Re: How to obtain contour data through contour command? By: kagoldberg on Tue, 22 October 2013 14:50

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