[gradsusr] Error from GR2STN

[Stephen McMillan]

Athanasios,

How to fix x and y:  'set x 1';'set y 1'  (note: it doesn't have to be 1,
it can be fixed to any x and y (or lon and lat) in the field)
Why to fix:  gr2stn won't work in your situation if x and y are varying
(see GrADS documentation provided previously)

For the 10 sites, you need only to fix x and y once for the same dataset.
 You specify a site's lon and lat when you do the gr2stn command for each
site.  To summarize:

'set gxout print'
'set prnopts ...'
'set x ...'
'set y ...'
'set z ....'
'set t ...'
'd gr2stn(var, lon, lat)'   do this in a loop for each timestep

Stephen Mc


On Mon, Oct 14, 2013 at 3:54 AM, Athanasios Karagiannidis
<thankar at live.com>wrote:

> Dear Stephen thank you for yor reply.
>
> I believe that the problem that i do not understand how (and why) to fix x
> and y. I set z and t at a specific value, but i do not understand why to
> fix x and y.
> I have a grid of one surface variable and want to extract the value of the
> variable at 10 different station sites. Can i use the GR2STN at the 10
> sites? And if i can, how do i fix x and y, as you mentioned?
>
> Athanasios
>
> Athanasios F. Karagiannidis
> Physicist, PhD Meteorology and Climatology
> E-mail: thankar at live.com
>
>
>
> ------------------------------
> Date: Fri, 11 Oct 2013 09:25:53 -0400
> From: smcmillan at planalytics.com
> To: gradsusr at gradsusr.org
> Subject: Re: [gradsusr] Error from GR2STN
>
> Athanasios,
>
> You did not provide set up/dimension information, but be sure both x and y
> are fixed before doing the command.  Also, if time is fixed, use 'set gxout
> print' and 'set prnopts...' so it will display properly.
> For more information, please see documentation and examples at
> http://grads.iges.org/grads/gadoc/gradfuncgr2stn.html .
>
> Good luck--
> Stephen McMillan
>
>
> On Fri, Oct 11, 2013 at 7:40 AM, Athanasios Karagiannidis <
> thankar at live.com> wrote:
>
> Hello to all.
> I'm trying to use GR2STN, but i get the following error:
>
> *Error from GR2STN: 2nd argument is not a station expression
> Operation Error:  Error from gr2stn function
>   Error ocurred at column 1
> DISPLAY error:  Invalid expression
>   Expression = gr2stn(tmp2m,21,21)
> *
>
> Could anyone help?
>
> Thanx in advance.
>
>
> Athanasios F. Karagiannidis
> Physicist, PhD Meteorology and Climatology
>
> E-mail: thankar at live.com
>
>
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