Re: To change the time variable attributes in merged netCDF file

Not sure why you want to change the begin time. It does not matter.
It is arbitrary
If the combined file created by ncrcat
is m1850-2100.nc

%> ncrcat -O m1850-2005.nc m1850-2005.nc m1850-2100.nc

then

%> ncks -d time,612,, m1850-2100.nc m1901-2100.nc

I think the 612 is correct for 190101

Using NCL interactively:

ncl <return>

f = addfile("m1901-2100.nc", "r")
time = f->time
yyyymm = cd_calendar(time, -1)

print(time+" "+yyyymm)

You should see the 1st time as 190101

On 4/11/12 4:28 PM, Noel Aloysius wrote:
> Hi NCL-talk,
>
> I used NCO operator 'ncrcat' to merge two monthly timeseries files
> ("1850-2005" + "2006-2100") and, then, created a subset for the period
> 1901-2100 monthly values. The resultant netCDF file has the time
> attributes set to begin on 1850-01.
>
> To change the time attribute, I tried to create a new file and transfer
> all the data to that. I am able to define and create all the attributes
> but when I tried to write the data values (precipitiation values in this
> case) I get error that says
>
> "fatal:Variable (pr) is undefined"
>
> I have attached the script. I appreciate your help to resolve this issue.
>
> Thanks,
> Noel
>
>
>
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Received on Wed Apr 11 16:57:54 2012