nc3to4

**Needs R2011a or later**
NC3TO4 Create a NetCDF4 classic model file from an existing NetCDF 3 (classic) file.

NC3TONC4(NC3FILE, NC4FILE) creates a new NetCDF4 classic model file,
NC4FILE, from an existing NetCDF 3 (classic) file, NC3FILE.

NC3TONC4(NC3FILE, NC4FILE, DEFLATELEVEL) creates a new NetCDF4 classic
model file, NC4FILE, from an existing NetCDF 3 (classic) file,
NC3FILE. DEFLATELEVEL is a numeric value specifying the compression
setting for the deflate filter. LEVEL should be between 0 (least) and
9 (most).
Note: The chunk size is selected automatically by the NetCDF library.

Example:
% Create a sample NetCDF 3 (classic) file, with very simple data
nccreate('nc3.nc','Ones',...
'Dimensions',{'r' 200 'c' 200},...
'Format','classic');
ncwrite('nc3.nc','Ones',ones(200));
finfo3 = dir('nc3.nc');
disp(['NetCDF 3 (Classic) size: ' num2str(finfo3.bytes)]);
% Conver to NetCDF4 Classic format.
nc3to4('nc3.nc','nc4.nc',9);
finfo4 = dir('nc4.nc');
disp(['NetCDF 4 (Classic model) size: ' num2str(finfo4.bytes)]);