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Re: position of min or max
Hi Martin,
As you say, the value of the maximum can be found with
let vmax = v[x=@max,y=@max]
There are a number of ways of finding the location of this (or any other)
value. I'd say the most straightforward is with the @LOC transformation
(see Users guide):
let xloc = v[x=@loc:`vmax`] ! note the use of grave accent tic marks
and similarly with "x" replaced by "y" to find the latitude.
To find the corresponding I index you can use
let iloc = I[g=v,x=`xloc`] ! again, grave accents
or you can use the more general techniques described under the @WEQ
(weighted equal) transform, which allows you to evaluate any variable at a
location defined by some other variable.
- steve
============================================
Martin Junier wrote:
> Dear ferret users,
>
> Looking in the mail archive, I saw that this question has allready been
> posted in october 1999, but I had not been able to find the solution (if
> there is one).
>
> I would like to find the position of the min and/or max of a given
> variable. Finding the min and max values is easy using 'statistics' or
> @min and @max. But how can I know WHERE in my grid they are located in
> the (i,j,k,l) or (x,y,z,t) systems.
>
> Thanks for help,
>
> Martin Junier
>
> --
> +-----------------------------------------------------+
> | Martin Junier |
> | Laboratoire de pollution atmosphérique - LPA |
> | Département de Génie Rural |
> | Ecole Polytechnique Fédérale de Lausanne |
> | CH - 1015 Lausanne |
> | tel.: ++41 21 693 57 01 - fax.: ++41 21 693 51 45 |
> | e-mail: martin.junier@epfl.ch |
> +-----------------------------------------------------+
--
Steve Hankin
NOAA/PMEL, 7600 Sand Point Way NE, Seattle, WA 98115-0070
ph. (206) 526-6080 -- FAX (206) 526-6744
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