[gradsusr] Displaying data from NetCDF; outputting text files; using comparitive statistics

[James Ciarlo`]

Dear Muhammad,

I am sorry it took me so long to answer. Thank you for your answer on point
2.

Regarding point 1, opening .nc files. I have attached some files.
The images from file1.jpg and file2.jpg are grads images (printim) from nc
files produced with RegCM4, one is gxout contour and the other is gxout
shaded.
The image from file3.jpg is a grads image (printim) gxout shaded for an nc
file from the ESRL database.
The last image was produced with the PANOPLY data viewer from the same file
that produced file3.jpg

As you can see the data is not being plotted with grads as with normal .ctl
files (which are working properly).
I cannot seem to understand why it is not reading it properly. Maybe there
are some definitions that I have to set? How should I check if all the
settings are correct?

Regarding point 3, I think I can do them as a normal mathematical
expression, but I'll be trying that later on.

Regards,

James

On 11 December 2010 12:24, James Ciarlo` <james.ciarlo at physics.org> wrote:

> Dear Muhammad,
>
> I just had a look at it this morning. Unfortunately I haven't yet had the
> time to put it to use. Thank you very much for your help. I will get back to
> you about it for sure. Thanks again
>
> Regards,
>
> James
>
>
> On 11 December 2010 09:59, Muhammad Rahiz <muhammad.rahiz at ouce.ox.ac.uk>wrote:
>
>> Hi James,
>> I was wondering if you got my reply to the query you posted because I'm
>> not sure if it gets delivered successfully.
>>
>> Anyway, if you did not, these are what I suggested
>>
>> 1. display error
>> - Try set gxout to something other than the default e.g. set gxout grfill
>> - set clevs
>> - check units
>>
>> 2. print to ascii
>> what you need is the fprintf.gs script available at
>> http://cookbooks.opengrads.org/index.php?title=Recipe-002:_Saving_GrADS_variable_data_to_a_text_file
>>
>> Copy the code and name the file as fprintf.gs. Then do the following,
>>
>> sdfopen input.nc
>> d var                   # where var = variable fprintf var dat.txt      #
>> prints data of var
>> fprintf lon lon.txt     # prints corresponding lon
>> fprintf lat lat.txt     # prints corresponding lat
>>
>> 3. statistical analysis
>> I know how to do so in R. If you're interested in using R for this
>> purpose, I can help.
>>
>>
>> HTH,
>>
>> --
>> Muhammad Rahiz
>> Researcher & DPhil Candidate (Climate Systems & Policy)
>> School of Geography & the Environment
>> University of Oxford
>>
>> On Fri, 10 Dec 2010, James Ciarlo` wrote:
>>
>>  Dear all,
>>> I am using GrADS 2.0.a9 on LINUX. I am trying to compare measured and
>>> modelled data by using GrADS. However since I am new with the program, there
>>> are
>>> some issues that I cannot seem to figure out, or find a solution to
>>> understand.
>>> I am experiencing:
>>>
>>> 1) Difficulty with displaying data from NetCDF files
>>> I have opened the file with the command 'sdfopen'
>>> When I tried 'd prmsl' I got the following error:
>>> Operation error:  Invalid dimension environment
>>>   Min longitude > max longitude: 320 144
>>> So I used ' set lon -40 145' and tried the display command again
>>> I got the following line and the image attached (ncimage.jpg):
>>> Contouring: 99000 to 102300 interval 300
>>> And I am getting similar results with other nc files
>>>
>>> 2) Difficulty with finding a command to output text files, or dat, or
>>> anything similar.
>>> I have used set lat, set lon, and set lev to obtain one value, and set t
>>> to get a long time interval, I have used d psa to display the time series, I
>>> can use printim file.jpg to get an image, but I cannot find a command to
>>> produce a file.txt so that I can make use of the actual numbers for
>>> statistical purposes.
>>>
>>> 3) Difficulty with finding a command to work out comparative statistics,
>>> particularly correlation and significance.
>>>
>>> Regards,
>>>
>>> James Ciarlo`
>>>
>>>
>
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