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Re: very simple but weird problem with CONTOUR [message #81280 is a reply to message #81278]

Sat, 01 September 2012 11:41

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

mxfong2012@gmail.com writes:

> I ran into a very simple but weird problem with CONTOUR. In the below example, everything was fine if I used "max_value=1". But when I changed it to "max_value=0.5", I had nothing but a black window. What is wrong? Am I missing anything here? I am using IDL Version 7.0.4, Mac OS X (darwin x86_64 m64)
>
> Thanks for any advices!
>
> example codes:
>
> X=findgen(6)/5.*2.-1.
> Y=X
> Z=randomu(1001L, 6,6)
>
> xrange=[-1,1]
> yrange=[-1,1]
> clevels=[1, 50, 100, 150, 200, 254]
> levels=[0, 0.2, 0.4, 0.6, 0.8, 1.0]
> loadct, 39
>
> plot, xrange, yrange, position=[0.1, 0.1, 0.9, 0.9], xstyle=5, ystyle=5, /nodata, /noerase
> contour, Z, X, Y, position=[0.1, 0.9, 0.1, 0.9], levels=levels, c_colors=clevels, /fill, /overplot, $
> xrange=xrange, yrange=yrange, xstyle=5, ystyle=5, xtitle='', ytitle='', max_value=0.5

If your maximum level is 0.5, and your first contour
is going to be drawn at 1.0, then all you can expect
to see is the background (black) of your contour plot. :-)

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.")

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[Message index]

		Re: very simple but weird problem with CONTOUR By: mxfong2012 on Sat, 01 September 2012 16:25
		Re: very simple but weird problem with CONTOUR By: David Fanning on Sat, 01 September 2012 15:20
		Re: very simple but weird problem with CONTOUR By: Phillip Bitzer on Sat, 01 September 2012 14:32
		Re: very simple but weird problem with CONTOUR By: mxfong2012 on Sat, 01 September 2012 13:25
		Re: very simple but weird problem with CONTOUR By: David Fanning on Sat, 01 September 2012 11:41

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