Cdo operation error of invalid character at position 1! in nc file

Question

I am trying to execute the command

cdo subc,SCM5_His_mean.nc ob_MAMJ_mean.nc SCM5_His_mb.nc

but I'm getting this error:

cdo subc (Abort): Float parameter >SCM5_His_MAMJ_mean.nc< contains invalid character at position 1!

The SCM5_His_MAMJ_mean.nc file was originally in curvillinear grid format and was interpolated to regular grid using remapbil in cdo. Where could be the problem as the interpolation returned satisfactory results?

score 0 · Accepted Answer · answered Jun 28 '21 at 07:57

The command subc mean "subtract a constant" and needs a float or integer argument after it, e.g. the following command would subtract 273.15 from the field contained in temp_in_K.nc and put the result in the output file temp_in_C.nc (note that the meta data is not changed, however):

cdo subc,273.15 temp_in_K.nc temp_in_C.nc

If you want to subtract the field in SCM5_His_mean.nc from the field in ob_MAMJ_mean.nc, then the correct command is sub

cdo sub file1.nc file2.nc file1-file2.nc

the last name is the output

Thank you very much Sir for the answer. It worked. – saumya singh Jun 28 '21 at 08:19 — saumya singh, Jun 28 '21 at 08:19

Cdo operation error of invalid character at position 1! in nc file

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