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Re: plot [message #68551 is a reply to message #7831]

Tue, 03 November 2009 06:41

pgrigis
Messages: 436
Registered: September 2007

Senior Member

On Nov 2, 6:25 pm, chris <rog...@googlemail.com> wrote:
> On 30 Okt., 17:23, bing999 <thibaultga...@gmail.com> wrote:
>
>
>
>> No, i don't want the contour to be based on the weight of the points,
>> neither set the important points by myself ( i want to do it
>> automatically for several plots...)
>
>> Going back to the sketch :) :
>
>> P
>> PaP
>> PaaP
>> PaaaP
>> PaaaaaP
>> PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP
>
>> I just want the contour to connect all the points on the very left,
>> right, top and bottom, that is to say, all the P points = the
>> surrounding points actually.
>
>> Cheers
>
> Hi,
> I think, you should apply some kind of linescan of rounded coordinates
> of your scatter gram, so you would determine the first "fit" and the
> last "fit" within a scanned line (column or row) with your rounded
> data points, determine for each fit within the line its nearest
> neighbour and store them. Then, you scan the next line and so on.
> After this you can connect your stored points by computing lines
> between the points, round the coordinates of the lines, sort the
> unique entries and store them and so on... Maybe it's a typical
> clipping problem which can be combined with some nearest neighbor
> approaches...
>
> Only my 2 cents
>
> Regards
>
> CR

OK - but is there a unique solution at all?

For instance, if you have these 5 points marked as X

X---X
--X--
X---X

What would be the desired polygon?

We already excluded the rectangular
convex hull.

Then what? We cut out one triangle to the center?

|\/|
|__|

Which one of the possible 4 then?

Or two triangles?

|\/|
|/\|

Or 3? Or 4?

I still think that the problem as stated
is ill-posed.

Ciao,
Paolo

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[Message index]

		plot By: collier on Fri, 10 January 1997 00:00
		Re: plot By: David Fanning on Thu, 20 November 2003 05:52
		Re: plot By: Jeremy Bailin on Sat, 31 October 2009 07:39
		Re: plot By: pgrigis on Fri, 30 October 2009 13:57
		Re: plot By: David Fanning on Fri, 30 October 2009 13:47
		Re: plot By: pgrigis on Fri, 30 October 2009 12:58
		Re: plot By: David Fanning on Fri, 30 October 2009 12:39
		Re: plot By: pgrigis on Fri, 30 October 2009 12:32
		Re: plot By: R.G.Stockwell on Fri, 30 October 2009 11:53
		Re: plot By: Thibault Garel on Fri, 30 October 2009 09:50
		Re: plot By: David Fanning on Fri, 30 October 2009 09:33
		Re: plot By: Thibault Garel on Fri, 30 October 2009 09:23
		Re: plot By: rogass on Mon, 02 November 2009 15:25
		Re: plot By: David Fanning on Fri, 30 October 2009 08:01
		Re: plot By: Thibault Garel on Fri, 30 October 2009 07:25
		Re: plot By: David Fanning on Fri, 30 October 2009 06:06
		Re: plot By: Thibault Garel on Fri, 30 October 2009 05:55
		Re: plot By: David Fanning on Fri, 30 October 2009 05:11
		Re: plot By: pgrigis on Tue, 03 November 2009 06:41
		Re: plot By: greg.addr on Thu, 05 November 2009 03:35
		Re: plot By: rogass on Mon, 30 November 2009 23:56
		Re: plot By: David Fanning on Tue, 01 December 2009 05:08
		Re: Plot By: David Fanning on Fri, 09 December 2011 12:44
		Re: Plot By: David Fanning on Fri, 09 December 2011 12:34
		Re: Plot By: Russell[1] on Fri, 09 December 2011 12:23
		Re: Plot By: d.poreh on Fri, 09 December 2011 11:46
		Re: Plot By: d.poreh on Fri, 09 December 2011 10:28
		Re: Plot By: Russell[1] on Fri, 09 December 2011 08:09
		Re: Plot By: David Fanning on Fri, 09 December 2011 07:38
		Re: Plot By: d.poreh on Tue, 13 December 2011 10:20
		Re: Plot By: d.poreh on Mon, 19 December 2011 05:10
		Re: Plot By: Mark Piper on Tue, 13 December 2011 08:18
		Re: Plot By: d.poreh on Sat, 10 December 2011 06:09
		Re: Plot By: David Fanning on Sat, 10 December 2011 06:39
		Re: plot By: d.poreh on Sat, 21 July 2012 12:59
		Re: plot By: David Fanning on Sat, 21 July 2012 11:10
		Re: plot By: d.poreh on Sat, 21 July 2012 11:01
		Re: plot By: lecacheux.alain on Sat, 21 July 2012 06:44
		Re: plot By: David Fanning on Sat, 21 July 2012 06:14
		Re: Plot By: d.poreh on Fri, 15 February 2013 05:52
		Re: Plot By: David Fanning on Fri, 15 February 2013 05:40

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