[ncl-talk] max index on a single dimension for a multidimensional array without loop

[Kyle Griffin]

Hi Matt,

I think dim_max_n is what you're looking for.

https://www.ncl.ucar.edu/Document/Functions/Built-in/dim_max_n.shtml

Not sure if I've used it in this manner before, but if you specify the
dimension to find the max over (2nd argument) as 0, I think you should get
what you're looking for. As a built-in function, it should be faster than
looping over each point.


Kyle

----------------------------------------
Kyle S. Griffin
Department of Atmospheric and Oceanic Sciences
University of Wisconsin - Madison
Room 1407
1225 W Dayton St, Madison, WI 53706
Email: ksgriffin2 at wisc.edu

On Wed, Sep 9, 2015 at 9:08 PM, Matthew Fearon <Matthew.Fearon at dri.edu>
wrote:

> Dear NCL Users,
>
> Trying to get the index of the maximum value on a single dimension as part
> of a multidimensional array. The array is data(time, lat, lon) where nlat x
> nlon is 400x500 and ntime=24. Would like the maximum over the time
> dimension for each grid cell or lat/long. Has anymore performed this
> without a loop over nlat/nlon ?
>
> Making the array 1D (and using ind_resolve) allows me to get the max inds
> per dimension over the whole array, which isn't what I need.
>
> Any suggestions would be greatly appreciated.
> thanks,
> Matt
>
>
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