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%% Create New NetCDF File From Existing File or Template % This example shows how to create a new NetCDF file that contains the % variable, dimension, and group definitions of an existing file, but uses % a different format. %% % Create a file containing one variable, using the |nccreate| function. % Copyright 2015 The MathWorks, Inc. nccreate('myfile.nc','myvar') %% % Write data to the file. A = 99; ncwrite('myfile.nc','myvar',A) %% % Read the variable, dimension, and group definitions from the file using % |ncinfo|. This information defines the file's _schema_. S = ncinfo('myfile.nc'); %% % Get the format of the file. file_fmt = S.Format %% % Change the value of the |Format| field in the structure, |S|, to another % supported NetCDF format. S.Format = 'netcdf4'; %% % Create a new version of the file that uses the new format, using the % |ncwriteschema| function. A schema defines the structure of the file but % does not contain any of the data that was in the original file. ncwriteschema('newfile.nc',S) S = ncinfo('newfile.nc'); %% % *Note:* When you convert a file's format using |ncwriteschema|, you might % get a warning message if the original file format includes fields that % are not supported by the new format. For example, the netcdf4 format % supports fill values but the NetCDF classic format does not. In these % cases, |ncwriteschema| still creates the file, but omits the field % that is undefined in the new format. %% % View the format of the new file. new_fmt = S.Format %% % The new file, |newfile.nc|, contains the variable % and dimension definitions of |myfile.nc|, but does not % contain the data. %% % Write data to the new file. ncwrite('newfile.nc','myvar',A)