[gradsusr] doubt in cat command in grads

[lbyerle at yahoo.com]

Dipak and Eric
Binary/IEEE files will CAT properly if unformatted/direct access with no header.  As an example, with wgrib or wgrib2, use -no header options if converting to bin to remove the extra characters.

Lee

On Nov 27, 2011, at 12:24 AM, Eric Altshuler <ela at cola.iges.org> wrote:

> Dipak,
> 
> As far as I know, the only type of binary files you can 'cat' correctly are GRIB files. In general, if you cat two binary (or netcdf) files to make a third file, the output file will contain a spurious end-of-file (EOF) character that causes it to be corrupted. You're better off keeping the two files separate:
> 
> 'open rainc.ctl'
> 'open rainnc.ctl'
> 'set t 9'
> 'd rainc.1+rainnc.2'
> 
> Eric
> 
> ----- Original Message -----
> From: "dipak sahu" <dipakmath at gmail.com>
> To: gradsusr at gradsusr.org
> Sent: Saturday, November 26, 2011 6:37:54 AM
> Subject: [gradsusr] doubt in cat command in grads
> 
> 
> 
> Dear grads user 
> I have some doubt in cat command in grads. I have two sets of ctl and dat files in grads one is RAINC.ctl, RAINC.dat and another one is RAINNC.ctl, RAINNC.dat. And I tried to make these two .ctl file to one .ctl file. so I tried the following command to creat one .dat file 
> $ cat RAINC.dat RAINNC.dat > RAIN.dat 
> and also make one .ctl file RAIN.ctl containing both the parameters RAINC (1st variable)and RAINNC (2nd variable) 
> 
> for verification I tried two cases in grads 
> case-1 
> open RAIN.ctl 
> set t 9 
> d rainc+rainnc (it gives value 0 90) 
> 
> case-2 
> open RAINC.ctl 
> open RAINNC.ctl 
> set t 9 
> d rainc.1+rainnc.2 (it gives value 0 35) 
> 
> So, is there anything wrong with the cat command in grads. If so what is the alternate procedure to combine two .ctl and .dat files to make one file? 
> 
> welcome for your suggestion 
> dipak 
> 
> -- 
> ******************************************** 
> Dipak kumar Sahu, 
> Research Scholar, 
> Centre for Atmospheric Sciences., 
> Indian Institute of Technology,Delhi 
> email:- dipak_math at yahoo.com 
> ********************************************** 
> 
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