[gradsusr] how to create quantile scale

[Ondrej Vlcek]

Dear Bernd and John,
thank you for your quick answers and I am sorry, that I was not specific 
enough.
 
I know how to set "clevs" and "ccol". But my problem is different. Example of 
the image with which I am not satisfied is attached: most of the picture is 
drown in purple (values <0.01). My problem is how to define "clevs" in such a 
way that for each interval there would be approximately equal amount of pixels 
in the map. Which basicly means to convert the 2D array into 1D, sort it in an 
ascending order, determine values which correspond to the 10th, 20th, .. , 
90th quantile and use them to define "clevs".

Unfortunately I do not know GrADS functions which I could easily use for this 
purpose. 

I also note that I want to use this in an automatic GrADS script.

Ondrej

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