[gradsusr] define variable independent of time

[Becker, Bernd]

Jeff,
 
That is is the really hard part. 
Each item fx and obs describes a chunk of a time series.
One would have to manually calculate the start and end dates
with respect to the reference dfile. 
 
If only (and I think Mike explained it a long time ago, and I cannot
find the
email) one could
set file 1
set t 2 34
define whatever
set dfile 2
set t 6 39
define theother
 
and happily combine whatever with theother.
 
Think about multimodel ensemble hindcast analysis, trying to composit
observed phenomena with modelled phenomena that simply 
don't happen simultaneously. 
 
All the best,
Bernd.
 
 

--
Bernd Becker   Climate Impacts Product Development
Met Office Hadley Centre    FitzRoy Road  Exeter   Devon EX1 3PB  United
Kingdom
Tel.: +44 (0) 1392 884511 Fax: +44 (0)870 900 5050
E-mail:bernd.becker at metoffice.gov.uk -
http://www.metoffice.gov.uk/research/our-scientists/seasonal-to-decadal/
bernd-becker
http://www.metoffice.gov.uk/news/releases/archive/2011/weather-game


 

________________________________

From: gradsusr-bounces at gradsusr.org
[mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Jeffrey Duda
Sent: 10 September 2011 18:41
To: GrADS Users Forum
Subject: Re: [gradsusr] define variable independent of time


You can reference the time of a variable when you use it in a statement.
For example, you could do

'd var.2(time=12Z01JAN1996) - var.3(time=18Z13AUG2010)'

This should help you do what you want to do.

Jeff Duda


On Sat, Sep 10, 2011 at 3:30 AM, Becker, Bernd
<bernd.becker at metoffice.gov.uk> wrote:


	
	Thanks Arlindo,
	 
	That would be nice for single numbers.
	 
	It as one notch more elaborate:
	 
	  'set dfile 2'
	  'set t 2  33'
	  'define obs     = 'var'.2'
	
	 'set dfile 3'
	  'set t 2  33'
	  'define fx     = 'var'.3'
	
	file 2 and 3 have different time frames.
	 
	d fx-obs 
	 
	fails. 
	And it would be a real bummer to have to calculate the times
from one file relative
	to the other file.
	 
	Compositing in this way would be really hard. 
	 
	Enjoy the weekend!
	Bernd.
	 

	--
	Bernd Becker   Climate Impacts Product Development
	Met Office Hadley Centre    FitzRoy Road  Exeter   Devon EX1 3PB
United Kingdom
	Tel.: +44 (0) 1392 884511 Fax: +44 (0)870 900 5050
<tel:%2B44%20%280%29870%20900%205050> 
	E-mail:bernd.becker at metoffice.gov.uk
<mailto:E-mail%3Abernd.becker at metoffice.gov.uk>  -
http://www.metoffice.gov.uk/research/our-scientists/seasonal-to-decadal/
bernd-becker
	
http://www.metoffice.gov.uk/news/releases/archive/2011/weather-game
	

	 

________________________________

	From: gradsusr-bounces at gradsusr.org
[mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Arlindo da Silva
	Sent: 09 September 2011 17:40
	To: GrADS Users Forum
	Subject: Re: [gradsusr] define variable independent of time
	
	
	On Fri, Sep 9, 2011 at 12:05 PM, Becker, Bernd
<bernd.becker at metoffice.gov.uk> wrote:
	


		Simple question,
		complicated answer:
		
		I would like to composite stuff from several  files.
		
		Each file has its own time and date info in its own .ctl
file.
		
		How can I add elements from different such files?
		
		How can I break away from the strict treatment of the
time dimension in
		grads?
		
		open file1.ctl
		define a=ave(b,t=1,t=34)
		close 1
		open file2.ctl
		define c= ave(b,t=3,t=9)
		close 2
		etc.
		
		d a+c
		Cannot contour grid - all undefined values
		
		


	Try:

	d a(t=1)+c(t=1)


	-- 
	Arlindo da Silva
	dasilva at alum.mit.edu
	

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-- 
Jeff Duda
Iowa State University
Meteorology Graduate Student
www.meteor.iastate.edu/~jdduda <http://www.meteor.iastate.edu/%7Ejdduda>


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