[gradsusr] finding differences between two runs with ctl files having different number of variables

[Jagabandhu Panda]

Hello Jennifer

Version of GrADS: v2.0.a9 (little-endian readline printim grib2 netcdf
hdf4-sds hdf5 opendap-grids,stn geotiff shapefile)

YDEF for both files are same

I am using 'open'

The dimension variables and other environments set before executing:
--------------------------------------------------
ga-> open sing08040112d05nurbhgtah97p5ic.ctl
Scanning description file:  sing08040112d05nurbhgtah97p5ic.ctl
Data file sing08040112d05nurbhgtah97p5ic.dat is open as file 1
LON set to 103.552 104.116
LAT set to 1.1876 1.53311
LEV set to 0.01 0.01
Time values set: 2008:4:1:12 2008:4:1:12
E set to 1 1
ga-> open sing08040112d05nurbhgtxxl.ctl
Scanning description file:  sing08040112d05nurbhgtxxl.ctl
Data file sing08040112d05nurbhgtxxl.dat is open as file 2
ga-> set dfile 1
Default file set to: sing08040112d05nurbhgtah97p5ic.dat
ga-> define mcape1=mcape
Define memory allocation size = 216720 bytes
ga-> set dfile 2
Default file set to: sing08040112d05nurbhgtxxl.dat
ga-> define mcape2=mcape
Define memory allocation size = 216720 bytes
ga-> d mcape2-mcape1
Operation error:  Incompatable grids
  Dimension ranges aren't equivalent
  Dimension = 1
  1st grid range = 1 129   2nd = 1 129
  Error ocurred at column 14
DISPLAY error:  Invalid expression
  Expression = mcape2-mcape1
----------------------------------------------------------
As I mentioned earlier, the number of variables are different in both ctl
files because they are output from two different model runs and use
different model environments.........

Best regards
~Jagabandhu

On Wed, Jan 23, 2013 at 10:27 PM, Jennifer Adams <jma at cola.iges.org> wrote:

> What version of GrADS are you using?
> What does the YDEF statement look like in both descriptors?
> Are you using open or xdfopen?
> What is the dimension environment set to before you execute your display
> of mcape.2-mcape.1?
> --Jennifer
>
>
> On Jan 23, 2013, at 5:30 AM, Jagabandhu Panda wrote:
>
> Dear users:
>
>      Hope you guys are doing fine. I need your help or suggestions to
> overcome a problem. I have WRF output from two model runs with same
> horizontal and vertical resolutions. I have two ctl files for this purpose
> with corresponding dat files for them. For both of these outputs, I have
> xdef, ydef, zdef and tdef same for both the files. However, the number of
> variables are different. One contains 166 variables and other 123. Since
> the model was tuned to produce more variables in the output file in the
> earlier case, the number of variables are more. However, in the later case
> it was not tuned to do so. On the other hand, they do produce same
> diagnostics after post processing.
>
> When I want to find the difference between say 2dcape field from these two
> runs, I am unable to do so as it says:
>
> Operation error:  Incompatable grids
>   Dimension ranges aren't equivalent
>
>   Dimension = 1
>   1st grid range = 5 117   2nd = 5 117
>   Error ocurred at column 16
> DISPLAY error:  Invalid expression
>   Expression = mcape.2-mcape.1
> EXEC error:  error in metvar.sh.  EXEC stopped.
> I am unable to point out how to proceed to find the differences each hour
> for a meteorological variable from the two runs. Could you please suggest
> some way to overcome it if possible. I will really be thankful to you for
> this purpose.
>
> Thanks and regards
> -- Jagabandhu
>
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>
> --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>
>
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