[gradsusr] Finding max values at each index for several arrays

[Matt Bunkers - NWS Rapid City]

Jeff,

Your second option worked great.

Thanks!

-- Matt


On Mon, Apr 13, 2020 at 3:21 PM Jeff Duda <jeffduda319 at gmail.com> wrote:

> Matt,
> If you can group those arrays together using one of the dimensions (time,
> height, ensemble etc.) then you can use one of the built-in functions. If
> you can't do that, then you'd have to get creative and use a recursive
> function to find maxes of increasingly complex pairs of arrays using nested
> if() statements. For example:
>
> Start with any pair of two fields.
>
> 'define maxfield = if(field1 > field2,field1,field2)'
> 'maxfield = if(field3 > maxfield,field3,maxfield)'
> 'maxfield = if(field4 > maxfield,field4,maxfield)'
> ...
> ...
> ...
> 'maxfieldfinal = if(field'n' > maxfield,field'n',maxfield)'
>
> You can probably use a while loop to handle the intermediate steps there.
>
> Jeff Duda
>
> On Mon, Apr 13, 2020 at 2:06 PM Matt Bunkers - NWS Rapid City <
> matthew.bunkers at noaa.gov> wrote:
>
>> Hello,
>>
>> I am trying to fund a function (or otherwise straightforward way) to find
>> the max value at each index (i, j) for several 2D arrays (e.g., input 8
>> arrays and get 1 array that has the max value for each grid point). GrADS
>> only seems to have functions to calculate the max over an individual
>> array.  Does anyone know of a script to do this?
>>
>> Thanks,
>>
>> -- Matt
>>
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>
>
> --
> Jeff Duda, Research Scientist
> University of Colorado Boulder
> Cooperative Institute for Research in Environmental Sciences
> NOAA/OAR/ESRL/Global Systems Laboratory
> Boulder, CO
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