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From: Dr. Johannes Zellner <johannes@ze...>  20070306 21:01:54

Hello, forgive me, this is OT, but I guess the guys at this list might be able to give me help. I frequently like to splot a (pm3d) surface for which I have arbitrary x, y, z vertices. The surface is usually wellbehaved in a sense that it's smooth, w/o singularities and has only longrange (low frequency) changes. As first approximation  and this is the best I have  I use 'splot with points' using 'linetype pal' to get colors and I use pretty large point sizes to get part of the surface "covered". Any ideas how to get a real closed surface?  I guess I'd need something like a function which searches the closest vertices (in x, y) and then connects the vertices by triangular surfaces. Any hints much appreciated.  Johannes 
From: <HBB<roeker@t...>  20070306 21:31:48

Dr. Johannes Zellner wrote: > Any ideas how to get a real closed surface?  I guess I'd need > something like a function which searches the closest vertices (in x, y) > and then connects the vertices by triangular surfaces. What you're looking for is (a variation of) 'set dgrid3d'. I'm slightly worried you didn't manage to find that in the documentation by yourself. 
From: Dr. Johannes Zellner <johannes@ze...>  20070307 20:26:37

HansBernhard, Thanks! This was indeed what I was looking for and it works already pretty well. What I'd need now, is to invalidate the data outside some distance to the data points. Suppose I've data whithin a banana shape in x, y and like to have colored pm3d rectangles only when x, y are near the banana (which is defined by the scatter x, y data points). Maybe you've a quick solution for this problem as well? ;)  Johannes On Tue, Mar 06, 2007 at 10:36:00PM +0100, HansBernhard Bröker wrote: > Dr. Johannes Zellner wrote: > > Any ideas how to get a real closed surface?  I guess I'd need > > something like a function which searches the closest vertices (in x, y) > > and then connects the vertices by triangular surfaces. > > What you're looking for is (a variation of) 'set dgrid3d'. I'm slightly > worried you didn't manage to find that in the documentation by yourself. > > >  > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveysand earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > gnuplotbeta mailing list > gnuplotbeta@... > https://lists.sourceforge.net/lists/listinfo/gnuplotbeta 
From: <HBB<roeker@t...>  20070307 22:16:04

Dr. Johannes Zellner wrote: > What I'd need now, is to invalidate the data outside some distance to > the data points. Sorry, no can do. You must have seen me state this before: gnuplot is a plotting program, not a generalpurpose number crunching engine. There are limits to what it'll do, and you've just hit one. > Suppose I've data whithin a banana shape in x, y and > like to have colored pm3d rectangles only when x, y are near the banana > (which is defined by the scatter x, y data points). In its general case it's already a surprisingly tricky task to come up with a usable formal definition of such "banana shapes" that computers can test, much less generate by themselves. 