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Re: Contour Problem [message #39072 is a reply to message #7115]

Mon, 26 April 2004 06:22

btt
Messages: 345
Registered: December 2000

Senior Member

Christopher Lee wrote:
> On Fri, 23 Apr 2004 17:11:11 -0500, Jeff Patrick wrote:
>
>
>> I keep getting the following error in my code and I can't figure out why.
>> Any help would be appreciated.
>>
>> % Internal error: Triangulation is invalid.
>>

>
> There are identical points in the data, triangulate works (in a fluffy,
> wordy kind of way) by drawing circles which have the points on the
> circumference. If the points are identical, it can't work. (This would be
> my guess).
>
> There are colinear points which otherwise satisfy the Delauney
> Triangulation algorithm, (good luck finding these). The triangle will be
> 'flat', i.e not a triangle. If this is going to happen, it would most
> likely happen on the first three points, which are needed to bootstrap the
> algorithm.
>
Hello,
The GRID_INPUT (IDL 5.5+) can be used to fish out the duplicate data
triplets before the call to TRIANGULATE. See the DUPLICATES keywprd to
GRID_INPUT.

Ben

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[Message index]

		CONTOUR problem By: Reginald Tang on Tue, 01 October 1996 00:00
		Re: Contour Problem By: btt on Mon, 26 April 2004 06:22
		Re: Contour Problem By: Christopher Lee on Sat, 24 April 2004 04:39
		Re: Contour Problem By: Jeff Patrick on Mon, 26 April 2004 09:04
		Re: Contour Problem By: James Kuyper on Mon, 26 April 2004 11:14
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 07:09
		Re: CONTOUR problem By: David Fanning on Wed, 27 August 2008 07:14
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 07:02
		Re: CONTOUR problem By: David Fanning on Wed, 27 August 2008 07:13
		Re: CONTOUR problem By: Wox on Wed, 27 August 2008 01:06
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 08:02
		Re: CONTOUR problem By: Wox on Wed, 27 August 2008 08:00
		Re: CONTOUR problem By: David Fanning on Wed, 27 August 2008 07:51
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 07:41
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 07:16
		Re: Contour Problem By: David Fanning on Mon, 25 July 2011 11:13

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