netcdf.endDef

End netCDF file define mode

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Syntax

netcdf.endDef(ncid)
netcdf.endDef(ncid,h_minfree,v_align,v_minfree,r_align)

Description

netcdf.endDef(ncid) takes a netCDF file out of define mode and into data mode. ncid is a netCDF file identifier returned by netcdf.create or netcdf.open.

netcdf.endDef(ncid,h_minfree,v_align,v_minfree,r_align) takes a netCDF file out of define mode, specifying four additional performance tuning parameters. For example, one reason for using the performance parameters is to reserve extra space in the netCDF file header using the h_minfree parameter:

ncid = netcdf.endDef(ncid,20000,4,0,4);

This reserves 20,000 bytes in the header, which can be used later when adding attributes. This can be extremely efficient when working with very large netCDF 3 files. To understand how to use these performance tuning parameters, see the netCDF library documentation.

This function corresponds to the nc_enddef and nc__enddef functions in the netCDF library C API. To use this function, you should be familiar with the netCDF programming paradigm.

Examples

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Open Script

When you create a file using netcdf.create, the functions opens the file in define mode. This example uses netcdf.endDef to take the file out of define mode.

Create a netCDF file.

ncid = netcdf.create('foo.c','NC_NOCLOBBER');

Define a dimension.

dimid = netcdf.defDim(ncid,'lat',50);

Leave define mode.

netcdf.endDef(ncid)

Making a change, when not in define mode, will return an error. For this example the define mode was ended, using the netcdf.endDef function, therefore typing dimid = netcdf.defDim(ncid,'lon',50) in the command window should return an error.

See Also

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