[ncl-talk] Getting time series from several files in ncl

[Barry Lynn]

Zilore:

T2 is a three dimensional variable.  Also, T2 is the two meter temperature.

You want tc or tk (see:
https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_getvar.shtml).

Could you please explain how you are interpolating to 850 mb?  There is a
WRF program to do this, and I am not sure how the indexing you are using
works. How are you indexing the 48 time slot?  WRF has a program to list
times, and you can match the time you want to the listed times to find the
index.

Barry

On Mon, Apr 20, 2020 at 8:17 AM zilore mumba via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Sorry Rick I put in a surface variable T2 which only 3 coordinates, so I
> put "x = a[:]->T2(0,{-15},{30})". Now I am getting error of coordinates
> west-east and south-north not having  associated coordinate variables. I
> have seen this error before. I will find out how to get out of it
>
> On Sunday, April 19, 2020, 11:53:33 PM GMT+2, Rick Brownrigg <
> brownrig at ucar.edu> wrote:
>
>
> Perhaps do a printVarSummary(a[0]->T2)  ; it sounds like its not the shape
> you think it might/should be; i.e. 3D vs 4D
>
>
>
> On Sun, Apr 19, 2020 at 3:29 PM zilore mumba <zmumba at yahoo.com> wrote:
>
>
>
> On Sunday, April 19, 2020, 11:27:47 PM GMT+2, zilore mumba <
> zmumba at yahoo.com> wrote:
>
>
> Thanks Rick, that is close. The error am getting now is:
> fatal:Number of subscripts on rhs do not match number of dimensions of
> aggregated cat type variable, (4) Subscripts used, (3) Subscripts expected
>
> On Sunday, April 19, 2020, 10:17:12 PM GMT+2, Rick Brownrigg <
> brownrig at ucar.edu> wrote:
>
>
> HI Zilore,
>
> I think the issue is that addfiles() return a *list* of filevars, where
> addfile returns a single filevar.  Lists are indexed with [ ] notation;
> perhaps something like this will work:
>
>   x = a[:]->T2(0,{850},{-15},{30})
>
> Rick
>
> On Sun, Apr 19, 2020 at 1:54 PM zilore mumba via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
> I am trying to get time series at given locations from several WRF output
> files, e.g. 48H forecast temperature at 850hPa. Each file contains a day's
> model run.
> I have used ncl for years by adapting existing scripts, without really
> understanding. One issue I have difficulty with is getting variables from a
> file, especially WRF output.
> I thought the script to get a time series at 15S, 30E would be as simple
> as the one below. I am able to print the varsummary, but printing x tells
> me that "a is not a valid file reference.
> I would appreciate ant assistance.
> begin
> files = systemfunc("ls -1 data/wrfout_d01_2020*") + ".nc"
>   a = addfiles(files,"r")
>
>   ListSetType (a, "cat")          ; concatenate (=default)
>   tc = wrf_user_getvar(a,"tc",0)
>   printVarSummary (tc)
>
>   x = a->T2(0,{850},{-15},{30})
>   asciiwrite("outfile.txt",x)
> end
>
> Zilore Mumba
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk



-- 
Barry H. Lynn, Ph.D
Senior Associate Scientist, Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20200420/3712537e/attachment.html>