# Re: Where oh where

From: jrbuzan <jbuzan_at_nyahnyahspammersnyahnyah>
Date: Fri Oct 28 2011 - 19:13:35 MDT

Hmmm.
I guess I left a piece of information out.
The function is calculating a third array: hi (a polynomial that uses
Temp and RH as inputs)
The function (hi) only works over very specific combinations of t and
rh.

I could bound the Temperature range, as in your statement, however the
relative humidity range varies as temperature varies. I am not sure
how to continue the statement from that point.

-Jonathan

On Oct 28, 2011, at 8:58 PM, James Correia, Jr wrote:

> It might be complicated in fortran but I dont see how that effects
> the where in NCL.
>
> You can still write:
> var = where((t_ref2m .gt. 324.15) .or. (t_refm .lt. 293.15),
> Missing_value, t_ref2m) ; .and. would fail since 1 grid point can
> not have two values
>
> You can keep making changes to the array "var".
> ;code is untested
> jimmyc
>
> On Fri, Oct 28, 2011 at 7:43 PM, jrbuzan <jbuzan@purdue.edu> wrote:
> Hello,
>
> I have complicated where statement.
> I am not sure how to approach this in NCL. The examples do not seem
> to show how to bound a region with 2 arrays where there is a specific
> range that the function may be calculated.
>
> Is there a way to write multiple where statements within one where
> statement?
>
> Thanks,
>
> -Jonathan
>
> Example code.
> In fortran:
>
> WHERE ((t_ref2m.gt.324.15) .and. (t_ref2m.lt.293.15))
> Missing value
> ELSEWHERE
> WHERE ((rh_ref2m.lt.10.) .and. (t_ref2m.gt.322.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.20.) .and. (t_ref2m.gt.318.15) .and.
> (t_ref2m.lt.322.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.30.) .and. (t_ref2m.gt.314.15) .and.
> (t_ref2m.lt.318.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.40.) .and. (t_ref2m.gt.311.15) .and.
> (t_ref2m.lt.314.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.50.) .and. (t_ref2m.gt.308.15) .and.
> (t_ref2m.lt.311.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.60.) .and. (t_ref2m.gt.307.15) .and.
> (t_ref2m.lt.308.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.70.) .and. (t_ref2m.gt.306.15) .and.
> (t_ref2m.lt.307.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.80.) .and. (t_ref2m.gt.303.15) .and.
> (t_ref2m.lt.306.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.90.) .and. (t_ref2m.gt.301.15) .and.
> (t_ref2m.lt.303.15))
> Function
> END WHERE
> WHERE ((rh_ref2m.lt.100.) .and. (t_ref2m.gt.293.15) .and.
> (t_ref2m.lt.301.15))
> Function
> END WHERE
> END WHERE
>
>
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>
> --
>
> James Correia Jr.
> OU CIMMS Research Associate
> SPC HWT Liaison
>
> "The highest function of the teacher consists not so much in
> imparting knowledge as in stimulating the pupil in its love and
> pursuit. To know how to suggest is the art of teaching."
>
> ------------------------------------------------------------------------------------------
> The views expressed in this email do not necessarily reflect those
> of NOAA, the National Weather Service, or the University of Oklahoma.
> ------------------------------------------------------------------------------------------
>

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Received on Fri Oct 28 19:13:45 2011

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