How can I write NaN as missing_values ncwriteatt

what is command to write missing_value: 'NaN' as variable attribute,

my command is not right, does anyone know? thanks

ncwriteatt(output_filename,'to','_FillValue','NaN')

Error in ncwriteatt (line 52)

ncObj.writeAttribute(location, attName, attValue);

Answer 1

[Walter Roberson]

You cannot set the _FillValue of a variable after the variable is created.

https://www.mathworks.com/help/matlab/ref/nccreate.html#d126e1053932

FillValue — Replacement value for missing values

scalar | "disable"

Replacement value for missing values, specified as a scalar or "disable". The default value is supplied by the netCDF library. To disable replacement values, specify a value of "disable". You cannot disable FillValue when writing string data to files with format netcdf4.

Note

The nccreate function assigns the value of FillValue to the _FillValue attribute of the new netCDF variable varname. You cannot change the value of this attribute after you have created the variable.

This argument is available only for files with format netcdf4 or netcdf4_classic.