error in ctl file

[anushri dutta]

Respected Sir,
the command which I am using is the

'reinit'
'sdfopen taux.cdf'
'set gxout fwrite'
'set fwrite tauxobs.grd'
'set x 129.5 320.5'
'set y 121.5 171.5'
'set z 1'
'set t 1 24'
'd taux'
'disable fwrite'

and the data length in tauxobs.grd is 193*52*24*4, where nx=193, ny=52, and
t=24,
so, where is the error in file i am not getting it, that is it display the
variable for only time t=1, not for the other time,
please help me.

with redgards

anushri


On 2/4/09, Douglas Clark <dbcl at ceh.ac.uk> wrote:
>
> Anushri,
>
> It's difficult to know what the problem is unless you give more information
> about how you created the file!
>
> There's potentially quite a lot of information that you need to provide,
> but the following at least would be useful:
> * the script or commands that you used to perform the fwrite, and what
> GrADS output to the screen when you did this
> * the ctl file you created for the output
> * the results of the command "ncdump -h taux97-98.cdf" (if you have the
> ncdump utility)
>
> In the meantime, is it possible that you only wrote out 1 time of the
> netCDF file? How big is the file tauxobs.grd (e.g. ls -l in Unix)? If the
> grid is of size nx*ny points, one year of monthly data should give a file of
> size nx*ny*12*4 bytes. If your file is smaller, you haven't written all
> times, so repeat the fwrite stage after 'set t 1 12' (or whatever is
> appropriate). Try this first!
>
> Doug
>
>
> >>> anushridutta01 at GMAIL.COM 04/02/2009 07:20 >>>
> Dear Grads User,
> Hi,
> here I am facing a problem, that i want to write a binary data for
> the 12 month by data taux97-98.cdf, through fwrite function,
> but when I pot the data through ctl file,
> it display for a single month, not for all the months,
> and the error which it showing is
>
> ga-> open taux.ctl
> Scanning description file:  taux.ctl
> Data file tauxobs.grd is open as file 1
> LON set to 64.5 160
> LAT set to -15 10
> LEV set to 1 1
> Time values set: 1997:1:1:0 1997:1:1:0
> ga-> set t 1
> Time values set: 1997:1:1:0 1997:1:1:0
> ga-> d taux
> Contouring: -0.08 to 0.08 interval 0.02
> ga-> set t 2
> Time values set: 1997:2:1:0 1997:2:1:0
> ga-> d taux
> Low Level I/O Error:  Read error on data file
> Data file name = tauxobs.grd
> Error reading 192 bytes at location 313344
> Data Request Error:  Error for variable 'taux'
> Error ocurred at column 1
> DISPLAY error:  Invalid expression
> Expression = taux
>
>
> same as for the 3 to 12 month,
>
> I am not understanding why it is so,
> Please tell me, how do I achieve this,
>
> with regards
>
> anushri
>
>
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