[gradsusr] set clevs dynamically

[Jeff Duda]

Oh...in that case use a while loop to build a text string adding each
contour level.  Here's a simplified example from one of my own scripts:

 c_levs = ''
 c_cols = ''
 value = min_deg
 init_color_value = 16
 i = 0
 while (value <= max_deg)
  color_value = math_int(init_color_value + i*skips)
  i = i + 1
  c_levs = c_levs' 'value
  c_cols = c_cols' 'color_value
  value = value + diff
 endwhile
* These two lines are required since set ccols requires one more value than
set clevs
* at this point, i should be equal to n_levs
 color_value = math_int(init_color_value + i*skips)
 if (color_value > 69)
  color_value = 69
 endif
 c_cols = c_cols' 'color_value

 'set clevs 'c_levs
 'set ccols 'c_cols

Jeff


On Tue, May 21, 2013 at 8:49 PM, Sam Wilson <sam at surfline.com> wrote:

>  Hi Jeff,
>
>  Thanks for the response. I have the RGB values and the 'set ccols'
> command covered I think. Those will remain static no matter what the
> high/low temps are. I'm looking for how to work the 'set clevs' command,
> which I need to be variable from data file to data file, given that the
> temperature ranges will change. So, I'm wondering if I can create an array
> of clevs, and pass that to the 'set clevs' command.
>
>  Thanks,
> Sam
>
>
>
> On May 21, 2013, at 6:32 PM, "Jeff Duda" <jeffduda319 at gmail.com> wrote:
>
>   You need to also set the contour colors.  This means you will need to
> use the 'set rgb R G B' commands to define color numbers up to 255 (the
> highest allowable in Grads) and set the color values using the 'set ccols
> (list#)'.
>
>  Jeff Duda
>
>
> On Tue, May 21, 2013 at 6:41 PM, Sam Wilson <sam at surfline.com> wrote:
>
>>   Hi all,
>>
>>  I have a grads script that reads satellite data and figures out a
>> temperature range based on the data over an area:
>>
>>  sstrange = maxtemp – mintemp
>>
>>  I would like to have 254 levels (colors) between that high and low
>> temp, so I calculate an interval like so:
>>
>>  interval = sstrange/254
>>
>>  I have all the colors I need for the set ccols option, however I'm
>> wondering if there is a way to dynamically set clevs based on the high and
>> low temp and the interval.  I tried the below, but I don't think it worked:
>>
>>  i = 1
>> while (i < 254)
>> clev.i = mintemp+(interval*i)
>> 'set clevs 'clev.i
>> i = i + 1
>> endwhile
>>
>>  I also tried the following:
>>
>>  'set cmin 'finallowt
>> 'set cmax 'finalhight
>> 'set cint 'interval
>>
>>  But I get a message saying 'Too many contour levels -- adjusting cint'.
>>
>>  Any ideas if this is possible or how to solve it?
>>
>>  Thanks and best regards.
>>
>>  Sam
>>
>> _______________________________________________
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>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
>
>  --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
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>
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>


-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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