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Re: ASCII data plot



hello Rolando,
	Probably you are missing the trick at
/var="taox,taoy"
which reads alternative data points into taox and taoy. But your taox
and taoy are separate blocks of data and the suggestion to read this
kind of data is given at:
http://ferret.wrc.noaa.gov/Ferret/Documentation/Users_Guide/
current/fer_html.htm

under section Ch2 Sec6. TRICKS TO READING BINARY AND ASCII FILES.


Basically what you need to do, make soft link to your original data
file to two files (under unix environment):
ln -s var.dat varx.dat
ln -s var.dat vary.dat

and replace the reading line to these two lines:
file/var=taox/Columns=6/grid=mygrid varx.dat
file/var=taoy/skip=5/Columns=6/grid=mygrid vary.dat

/skip=n qualifier will skip n lines from the top in that
file. Your taoy starts after 5 lines in that file and so n is 5 in
that line.

Hope this helps,

arindam
------------------------------------------
 ARINDAM CHAKRABORTY
 Centre for Atmospheric & Oceanic Sciences
 Indian Institute of Science
 Bangalore 560 012; INDIA
 Tel: +91-80-2932505, +91-80-3600450
 Fax: +91-80-3600865
__________________________________________

On Tue, 8 Jul 2003, Rolando S. Balotro wrote:

> Hello All
> 
> I would like to read grid file of two variables (taox, taoy) in order to 
> plot a vector field. But somehow when I list the values they are not 
> consistent with my field.
> 
> file/var=alon lon1.dat
> file/var=alat lat1.dat
> 
> define axis/from_data/x/name=mlon/units=deg alon[d=1]
> define axis/from_data/y/name=mlat/units=deg alat[d=2]
> define axis/t=1:1:1 mtime
> define grid/x=mlon/y=mlat/t=mtime mygrid
> 
> cancel data/all
> file/var="taox,taoy"/Columns=6/grid=mygrid var.dat
> save/clobber/file=var.cdf taox, taoy
> 
> 
> Here is the data set
> 1 2 3.5 6 2 1
> 2 7.1 9 3 2 2
> 4 0 1 9 2 1
> 1.5 2.5 3 3 6 9
> 
> 1 2 3.5 6 2 1
> 2 7.1 9 3 2 2
> 4 0 1 9 2 1
> 1.5 2.5 3 3 6 9
> 
> Here is my erroneous listing
> 
> yes? list taox
>               VARIABLE : TAOX
>               FILENAME : var.dat
>               SUBSET   : 6 by 4 points (LONGITUDE-LATITUDE)
>               T        : 1
>                90W    89.5W  89W    88.5W  88W    87.5W
>                  1      2      3      4      5      6
>   19.5N  / 4:  4.000  1.000  2.000  1.500  3.000  6.000
>   19N    / 3:  1.000  3.500  2.000  2.000  9.000  2.000
>   18.5N  / 2:  4.000  1.000  2.000  1.500  3.000  6.000
>   18N    / 1:  1.000  3.500  2.000  2.000  9.000  2.000
> 
> yes? list taoy
>               VARIABLE : TAOY
>               FILENAME : var.dat
>               SUBSET   : 6 by 4 points (LONGITUDE-LATITUDE)
>               T        : 1
>                90W    89.5W  89W    88.5W  88W    87.5W
>                  1      2      3      4      5      6
>   19.5N  / 4:  0.000  9.000  1.000  2.500  3.000  9.000
>   19N    / 3:  2.000  6.000  1.000  7.100  3.000  2.000
>   18.5N  / 2:  0.000  9.000  1.000  2.500  3.000  9.000
>   18N    / 1:  2.000  6.000  1.000  7.100  3.000  2.000
> 
> 
> The grid points are consistent but the data are not. I cant figure out
> the source of error.
> 
> Thanks in advance
> 
> roland
> 
> 
> 




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