export variable as .nc file in matlab

To export a variable as a .nc (netCDF) file in MATLAB, you can use the ncwrite function from the MATLAB netcdf toolbox. First, you need to create a new netcdf file using the netcdf.create function, then add dimensions, variables, and attributes to the file, and finally use ncwrite to write the variable data to the file.

Here is an example code snippet:


main.m
% Define input variable
x = [1 2 3; 4 5 6; 7 8 9];

% Create netcdf file
filename = 'output.nc';
mode = netcdf.getConstant('NETCDF4');
ncid = netcdf.create(filename, mode);

% Add dimensions to the file
dimid1 = netcdf.defDim(ncid, 'dim1', size(x, 1));
dimid2 = netcdf.defDim(ncid, 'dim2', size(x, 2));

% Add a variable to the file
varid = netcdf.defVar(ncid, 'x', 'double', [dimid1, dimid2]);

% Add attributes to the variable
netcdf.putAtt(ncid, varid, 'long_name', 'Input variable x');
netcdf.putAtt(ncid, varid, 'units', '');

% End definition mode and write data to the file
netcdf.endDef(ncid);
ncwrite(filename, 'x', x);

% Close the file
netcdf.close(ncid);
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This will create a new netcdf file called "output.nc" and write the variable "x" to it. The dimensions of the variable are defined by the size of the input variable "x". You can modify the code to add additional dimensions, variables, and attributes as needed.

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