[gradsusr] Setting missing values (or any value) to undefined

[Jeff Duda]

Matt,
In what way did it not work? Can you show me the results from displaying
the original field and with the command I suggested? I may have
misunderstood the field you are using. Is it a temperature in degrees?

Jeff

On Fri, Oct 30, 2015 at 11:40 AM, Matt Bunkers - WFO UNR <
matthew.bunkers at noaa.gov> wrote:

> The maskout(WC,WC+119.9) option didn't work.  I've tried playing with
> different numbers but still get weird gradients.
>
> Can I include more than one value for the UNDEF variable in the ctl file?
> The documentation doesn't suggest so.
>
> Thanks,
>
> -- Matt
>
>
> On Fri, Oct 30, 2015 at 10:14 AM, Goodson,Ron [Edm] <Ron.Goodson at ec.gc.ca>
> wrote:
>
>> If this is the only data being analyzed .. then wouldn’t just setting
>> UNDEF in the ctl file be even easier (though I’ll admit the maskout is way
>> more flexible and necessary if you have a bunch of different variables that
>> each use different missing values).
>>
>>
>>
>> *From:* gradsusr-bounces at gradsusr.org [mailto:
>> gradsusr-bounces at gradsusr.org] *On Behalf Of *Jeff Duda
>> *Sent:* October 30, 2015 9:46 AM
>> *To:* GrADS Users Forum
>> *Subject:* Re: [gradsusr] Setting missing values (or any value) to
>> undefined
>>
>>
>>
>> maskout(WC,WC+119.9)
>>
>>
>>
>> On Fri, Oct 30, 2015 at 10:06 AM, Matt Bunkers - WFO UNR <
>> matthew.bunkers at noaa.gov> wrote:
>>
>> Hi,
>>
>>
>>
>> I have hourly wind chill (WC) grids for which I want to find the minimum
>> WC.  The problem I have is that some of the areas of the grids are missing
>> (set to -120).  When I compute the minimum WC and then display the result
>> (as either image or contour) I get huge gradients between the real data and
>> the missing data.  What I would like to do is set my missing data to
>> undefined (so they don't plot).  I've tried that with the const function
>> but that doesn't appear to work.  Is there another function that would
>> allow me to set a given value (-120 in this case) of my grid to undefined?
>> If it is set to undefined then when I plot the grid I shouldn't see those
>> horrendous gradients.
>>
>>
>> Thanks,
>>
>>
>>
>> -- Matt
>>
>>
>>
>>
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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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>>
>
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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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