[gradsusr] Function Sum for multiple variable within one file for each time t=1 to t=366

[Rafanoharana Serge Claudio]

Dear all,

I would like to sum two variable within one netcdf file for each time t=1 to
t=366.
I have one netcdf file (file.nc) which contains two variables a and b from
t=1 to t=366
What I am trying to do is to sum each value per time, I mean
sum a,b for t=1
sum a,b for t=2
...
sum a,b for t=366

I tried this command:

define c=sum(a+b, t=1, t=366)

but didn't give me what I needed.
What I expect to obtain is that the variable c will contain the SUM of the
two variables a and b from each t=1 to t=366
I hope you get my problem,

Best Regards,

Serge
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