Template problem

[John Guhin]

 Thanks Doug. I could do it in a linux with GrADS 1.9b4. But I think  this
version is not available for IBM/AIX (ncar supercomputers like bluevista),
so I could not do that there.  Please  correct me if I am wrong.
  A related question which comes from the above is following:
I have the following three control files and the corresponding binary files
are more than 1.5 GB.
199701_01-09_2D.ctl
199701_10-19_2D.ctl
199701_20-31_2D.ctl
So I have total 4.5 GB. Using cat to make a single file does not work (since
grads cannot handle more than 2 GB).  Is there any way I can open three
files, and do some calculation simultaneously!!! When I tried there is a gap
as expected in the figure generated using three data files.
Any help would be appreciated.




On 2/26/07, Douglas Clark <dbcl at ceh.ac.uk> wrote:
>
> John,
>
> Assuming that your files have 9 or 10 days' of data in each, I think
> you'll need to use the CHSUB option - see GrADS index
> http://grads.iges.org/grads/gadoc/gadocindex.html
> under control file > options > template (or the likes).
>
> With your current template, the way the template works is such that every
> day's data is assumed to be in a different file - because you have %d2 in
> the template. So when you set the time to 1997/01/01, GrADS looks for data
> in a file called 199701_01-01_2D.dat, which doesn't exist - so it says all
> values are undefined (arguably it might be more useful if GrADS said "can't
> find file" at this point, but it doesn't).  With time 1997/01/02, GrADS
> looks for data in a file called 199701_02-02_2D.dat, and so on.
>
> I think CHSUB will come to your rescue (although I have never used it
> myself). You need a ctl file with something along the lines of
> DSET ^199701_%ch_2D.dat
> CHSUB   1  9 01-09
> CHSUB   10  19 10-19
> CHSUB   20 31 20-31
> OPTIONS template
>
> The first two integers on each CHSUB line will depend on the time step
> given in yout TDEF line - I have assumed daily data. See the GrADS
> documentation for details.
>
> Doug
>
>
> >>> johnguhin at GMAIL.COM 26/02/2007 07:14 >>>
> Hi,
>        I have three files like these....
> 199701_01-09_2D.ctl
> 199701_10-19_2D.ctl
> 199701_20-31_2D.ctl
>
> I wrote a control file like this...
> dset ^199701_%d2-%d2_2D.dat
> options template
> ................................................
>
> I can open the control file, but while plotting it says
> Cannot contour grid - all undefined values
>
> But I can plot from individual files.  Where am I doing wrong?
>
> --
> John Guhin
>
>
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--
John Guhin
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