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Re: modify colors in contour plots [message #79764 is a reply to message #79763]

Tue, 03 April 2012 12:58

anil
Messages: 34
Registered: August 2009

Member

On Apr 3, 1:10 am, David Fanning <n...@idlcoyote.com> wrote:
> anil writes:
>> I have a contour plot of temperature. My temperature range is 4-26
>> celsius. I want to have the colors in the contour plot, such that I
>> can use lots of colors for the ranges [4-8] and [8-15] . What i want
>> to do is to give many colors to the range i want ( 4-8 celsius for my
>> case) , a few colors for the range [8-15] and just a single color to
>> [15-26] . How can i do this color distribution?
>
> You could do it like this:
>
> data = cgdemodata(2)
> data = scale_vector(data, 4.0, 26.0)
> levels = scale_vector(findgen(14), 4, 8)
> levels = [levels, scale_vector(findgen(8), 8, 15)]
> levels = levels[Uniq(levels)]
> cgLoadCT, 27, NCOLORS=22, /Brewer
> cgContour, data, LEVELS=levels, /Fill, C_Colors=Indgen(22), $
> Position=[0.1, 0.1, 0.9, 0.8]
> cgContour, data, LEVELS=levels, /Overplot
> cgColorbar, XTickV=[4, 11, 18, 25, 26], XTicks=4, $
> NColors=22, RANGE=[4,26], $
> TickNames=['4', '6', '8', '18', '26'], XMinor=0
> END
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Is there any other way of doing it without the cgcolorbar,
cgplots ,cg***?? Can't i just use contour and still do it? It was
working fine with contour except the colors but with the code above,
IDL gives:
% CONTOUR: Warning: Infinite plot range.
% CONTOUR: Warning: Infinite plot range.
% CONTOUR: Warning: Infinite plot range.

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[Message index]

		Re: modify colors in contour plots By: David Fanning on Tue, 03 April 2012 13:33
		Re: modify colors in contour plots By: David Fanning on Tue, 03 April 2012 13:25
		Re: modify colors in contour plots By: Brian Wolven on Tue, 03 April 2012 13:12
		Re: modify colors in contour plots By: anil on Tue, 03 April 2012 12:58
		Re: modify colors in contour plots By: David Fanning on Mon, 02 April 2012 15:10

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