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Re: Why the contour does not show? [message #63874 is a reply to message #63873]

Fri, 21 November 2008 11:32

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

xiao writes:

> Hi~ guys. I have a problem here. I have a small program doing a
> contour plot. But is just show me the background, not the data. I
> guess there is something wrong with the colors. Can anyone help?
> Thanks
>
> lat=fltarr(75)
> lon=fltarr(75)
>
> latstep=(34.3842-31.6985)/74.0
> lonstep=(121.5581-118.3524)/74.0
>
> for i=0,74 do begin
> lat(i)=-31.6985-i*latstep
> lon(i)=118.3524+i*lonstep
> endfor
>
> print,max(lat),min(lat)
> print,max(lon),min(lon)
>
> device,decomposed=0
> !p.background = 255
> xs=600
> ys=600
> window,xsize=xs,ysize=ys
>
>
> contour,inits,color=0,xrange=[min(lon),max(lon)],yrange=[min (lat),max
> (lat)],xtitle='longtitude',ytitle='latitude',title='Sensible heat
> flux'

I'm going to guess this is because you are doing this
in PostScript and you are drawing white on white. There
are lots of articles to read on my web page about PostScript,
contour plots, and colors. You are making nearly every mistake. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Why the contour does not show? By: xiao zhang on Fri, 21 November 2008 12:19
		Re: Why the contour does not show? By: David Fanning on Fri, 21 November 2008 12:02
		Re: Why the contour does not show? By: xiao zhang on Fri, 21 November 2008 11:48
		Re: Why the contour does not show? By: David Fanning on Fri, 21 November 2008 11:32
		Re: Why the contour does not show? By: David Fanning on Fri, 21 November 2008 12:31

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