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Re: cgContour and NaN values [message #86119 is a reply to message #86117]

Tue, 08 October 2013 11:55

Andy Sayer
Messages: 127
Registered: February 2009

Senior Member

With the caveat that I haven't tested, this, I spot your code specifies missing=!Values.F_Nan . I'd either change that to -999, or else leave your missing values as !values.f_nan . I'd try that.

Andy

On Tuesday, October 8, 2013 1:58:09 PM UTC-4, Lim wrote:
> Dear all,
>
> I am having some trouble using contour with data which has NaN values. My valid range of data is -1 to 1. I have also change the NaN to -999. In that case the -999 appear as the same color as -1. I would like that the NaN values appear as white. Please, Could you tell me what I am doing wrong? (I am following a example I found at http://www.idlcoyote.com/graphics_tips/contourcolors.php but Im sure i missed somthing)
>
>
>
> my data is [192,145]
>
>
>
> data
>
> minval=-1.
>
> maxval=1.
>
> data=cgScaleVector(data, minval, maxval, /NaN)
>
>
>
> cgwindow
>
> ncontours = 10
>
> cgLoadCT, 22, /Brewer, /Reverse, NColors=ncontours
>
> clevels = cgScaleVector(Findgen(ncontours+1), minval, maxval, /NaN)
>
> colors = Bindgen(ncontours+1) + 1B
>
> cgContour, data, lons, lats, Levels=clevels, C_Colors=colors, /Fill, missing=!Values.F_Nan, Position=[0.125, 0.125, 0.925, 0.8], /AddCmd
>
> cgColorbar, NColors=ncontours, Range=[minval,maxval], Divisions=10, $
>
> Bottom=1, Ticklen=0.001, /AddCmd
>
>
>
> Thanks
>
> Lim.

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[Message index]

		cgContour and NaN values By: limiqt on Tue, 08 October 2013 10:58
		Re: cgContour and NaN values By: Andy Sayer on Tue, 08 October 2013 11:55
		Re: cgContour and NaN values By: limiqt on Wed, 09 October 2013 01:44
		Re: cgContour and NaN values By: Phillip Bitzer on Wed, 09 October 2013 16:05
		Re: cgContour and NaN values By: David Fanning on Thu, 10 October 2013 07:16
		Re: cgContour and NaN values By: limiqt on Tue, 15 October 2013 19:54

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