Re: [ferret_users] problem in reading .mc files.

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi,
I'm not sure what more to suggest. If you look at that file for time 21 with ncdump, is there anything different about the way the variable temp is specified?

You might try one of these tools for creating the descriptor file that's listed in Chapter 10.4.1 of the Ferret documentation:
 http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/converting-to-netcdf/CREATING-A-MULTI-FILE-NETCDF-DATA-SET#_VPID_367

You give the tool a list of your files and it'll check their time information and write the .mc file.

Ansley

yangxing zheng wrote:

Hi,

     Thank you for kind help. Ansley, I try your way,
using
repeat/l=1:22 shade temp
it stops at l=21. It can not plot temp, however, if I
plot u first,
yes?shade u
then I plot temp at l=21 again,
yes?shade temp
it works! It is really surpring to me about ferret
working.
P.S.: I using the individual cdf file (l=21), it has
no problem to plot temp

The following is what I try:
yes? set region/k=1/x=110w:100w/x=10s:0
yes? repeat/l=1:22 shade temp
.........
!-> REPEAT: L=15
!-> REPEAT: L=16
!-> REPEAT: L=17
!-> REPEAT: L=18
!-> REPEAT: L=19
!-> REPEAT: L=20
!-> REPEAT: L=21
 ** netCDF error: Variable not found
shade temp
Command file, command group, or REPEAT execution
aborted
yes? set region/l=21
yes? shade temp
 ** netCDF error: Variable not found
yes? shade u
yes? shade temp
......

------------------
Do you think it is a bug for ferret v5.70 Mac OS?
--- Ansley Manke <Ansley.B.Manke@xxxxxxxx> wrote:

  

Hi Yangxing,
Accessing data in Ferret occurs in several stages.
The command

    yes? set data test.mc

reads the .mc file to see what's in there, and it
uses that information 
to create the time axis. Then the first file is
opened, and information 
about the other axes and the variables is stored
from what's in that 
file. This is all that has happened at the point
where you do a SHOW 
DATA command. The other stepfiles are opened and
read only when data 
from them is required by the other commands - plot,
shade, load, or 
other commands that produce an output.

I wonder if one of the step files is missing the
variable TEMP.  Since 
you're seeing the error in the first 100 time steps,
you could try:

    yes? cancel region
    yes? repeat/L=1:100
(shade/x=110w:80w/y=10s:10n/k=1 temp)

And see if you hit an error message.


yangxing zheng wrote:
    

Thank all of you for prompt response. Now I
      

include
    

the .mc file to diagnose what the problem is.
--- Roman Tonkonojenkov <romantonk@xxxxxxx> wrote:

  
      

Hi Yangxing,

Maybe a stupid remark, but I had similar problems
        

in
    

the past and 
at least in one instance I was using the wrong
        

case
    

(i.e. the variable was
TEMP instead of temp). I don't think it is the
        

issue
    

with you,
but at least try it 
Cheers,
Roman

On Tue, Nov 13, 2007 06:39 PM, yangxing zheng
<yangxingz@xxxxxxxxx> wrote:
    
I have a problem about reading mc file from
        

ferret.
    

The following is an example. The files are
          

there.
    

We
    
        

show data/variables, the variable temp exists.
          

If I
    

make a plot by seting an individual l (set
region/l=11), it works. But if I want to plot
          

time
    

series of temp, it says: ** netCDF error:
          

Variable
    

not
    
        

found.
   But variable temp is obvious there. Also if I
      
          

plot
    
        

a time series of u and v (the grid is identical
          

to
    

temp), it does work! Do you think what the major
problem is? I attached the .mc file to you as a
reference.

      [mac35:yzheng/HYCOM/Pacific] yzheng%
          

ferret
    

       NOAA/PMEL TMAP
       FERRET v5.70 (alpha)
       Mac OS X 10.3.4 - 10/08/04
       13-Nov-07 16:08    

yes? set data test.mc
yes? show data/variables
    currently SET data sets:
   1> ./test.mc  (default)
    HYCOM-NCODA Assimilation Run NOGAPS
name     title                             I    
          

J         K         L
U        Zonal Velocity                   1:1376
          

      
1:937     1:19      1:425
            cm/s on grid GFP1 with -9999 for
      
          

missing
    
        

data
            X=180E:70W  Y=35.1S:35.1N  Z=-5:1050
          

V        Meridional Velocity              1:1376
          

      
1:937     1:19      1:425
            cm/s on grid GFP1 with -9999 for
      
          

missing
    
        

data
            X=180E:70W  Y=35.1S:35.1N  Z=-5:1050
          

TEMP     Temperature                      1:1376
          

      
1:937     1:19      1:425
            DegC on grid GFP1 with -9999 for
      
          

missing
    
        

data
            X=180E:70W  Y=35.1S:35.1N  Z=-5:1050
          

 time range: 03-NOV-2003 00:00 to 31-DEC-2004
      
          

00:00
    
        

yes? set region/l=12
yes? yes? set region/x=110w:80w/y=10s:10n/k=1
yes? yes? fill temp
yes? set region/l=1:100/i=100/j=700/k=1
yes? yes? plot temp
** netCDF error: Variable not found
yes? plot u
yes? plot v

----------------------------


    
      
          

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