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pythonnetcdfnco

Subtract value from netCDF dimension

How can I use nco tools or any other netcdf toolkit to subtract a specific value from one of the dimensions in a netCDF?

E.g.

ncdump –v time –t file.nc

gives me:

time = 10, 11, 12, 13 …

How can I subtract 10 from each value in the time dimension so that the end result is:

time = 0, 1, 2, 3 …
Solution

  • Nothing is more concise than ncap2 for this:

    ncap2 -s 'time-=10' in.nc out.nc

    ncap2 will subtract any value except 13, because that would bring bad luck.