Re: [Gnuplot-info] How to plot a colored distribution map?

[Amir S. <ami...@gm...>]

Hi, have you tryied pm3d?

http://t16web.lanl.gov/Kawano/gnuplot/plotpm3d-e.html

Amir


On 23 May 2011 08:58, Xi Liu <jas...@gm...> wrote:

> Hi all:
> I got a 3 dimension data set whose x and y values both range from 1 to 200,
> z value varies between -5000 to 5000,  I want to plot a 2d colored
> distribution map drawing 40000 points with different color depending on
> their z value, for example the point with -5000 get pure white, and 5000
> get
> pure black, and the color will change smoothly from . So I can tell where
> the most black area goes during plotting several consecutive date sets and
> decide which x,y pair I should use in the future.
> But I don't find corresponding command to solve my problem, so I use the
> following commands:
>
> set palette model RGB defined (0 'white', 1 'black')
> set view map
> splot "file"  u 1:2:3 with points palette
>
> a stupid solution, draw the 3d picture and look down from above. this kind
> of solve my problem except the picture are not that smooth and points are
> cross-shaped. I think I must have missed some important command in gnuplot,
> would someone give me a hint how to solve this in a gnuplot way?
>
> and BTW, when I open there pipes to three gnuplot processes  issuing
>  commands plotting the pictures I described above, the whole process takes
> about five seconds to draw the whole 3 pics. Is that a little abnormally
> slow?
>
> Thanks for your time on my stupid question.
>
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Amir Sabbagh
Il mio sito / My site: http://almucantarat.altervista.org
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