Adding multiple netcdf variables using nco tools

Question

Is there a nco operator to create a new variable by adding multiple variables in a single netcdf file? I know you can use ncdiff to subtract, is there anything equaivalent operator for adding?

N1B4 · Accepted Answer · 2016-06-24 19:48:35Z

4

Yes, NCO's ncbo function has subtraction, addition, multiplication, and division capabilities. For adding in specific, you can alternatively call ncadd. From the docs:

Definition: file_3 = file_1 + file_2
Alternate invocation: ncadd
op_typ key values: ‘add’, ‘+’, ‘addition’
Examples: ‘ncbo --op_typ=add 1.nc 2.nc 3.nc’, ‘ncadd 1.nc 2.nc 3.nc’

To add variables within a single netcdf file, you can use ncap2, e.g.

ncap2 -s 'var3=(var1+var2)' in.nc out.nc

edited Jun 24, 2016 at 19:48

answered Jun 24, 2016 at 19:40

N1B4

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2 Comments

user308827 Over a year ago

thanks, ncbo seems to add multiple netcdf files. I want to add some variables within a single netcdf file

N1B4 Over a year ago

I have edited my answer to show how to add variables within a single file.

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