nc_create¶

nc_create creates a new netCDF file.

Return Value

If the function succeeds, the return value is the handle of the newly created netCDF file. If the function fails, the return value is -1.

Parameters

nCreateMode

nCreateMode is NC_CLOBBER or NC_NOCLOBBER.

Value	Description
NC_CLOBBER	If the file already exists, a new file will be created, erasing the old file’s contents.
NC_NOCLOBBER	If the file already exists, nc_create returns -1.

The following attributes can be specified:

Name	Value	Description
NC_FORMAT_CLASSIC	0x0	creates a standard netCDF data file.
NC_FORMAT_PC	0x10000	The byte order of the Intel 80x86 will be used. The created files are not compatible to the netCDF file format. The advantage of this flag is that reading and writing is much faster.
NC_FORMAT_UP	0x20000	(Default) UniPlot data file will be created.

If the UniPlot data file format is used (NC_FORMAT_UP) the following attributes can be specified:

Name	Value	Description
NC_ZLIB_COMPRESSION	0x40000	A improved data compression is used. Reading and writing is slower, but the files are approx. 30 percent smaller.
NC_LZ4_COMPRESSION	0x100000	Fast compression, see https://code.google.com/p/lz4/. Currently not used. Old UniPlot version cannot read LZ4 compressed files.
NC_REPACKING	0x80000	If attributes or channels are removed, the file will automatically shrink. If this flag is not set the free space will be used to new attributes and channels.

The NC_COMPRESSION flag (old) is replaced by NC_ZLIB_COMPRESSION.

Example

ncid = nc_create("test.nc2");
ncid2 = nc_create("test2.nc2", NC_CLOBBER | NC_FORMAT_UP);

History

Version	Description
R2013.9	`NC_LZ4_COMPRESSION`.
R2012.0	New Parameter nCreateMode added.
5.6.0	New file format with new flags `NC_FORMAT_UP`, `NC_COMPRESSION` and `NC_REPACKING` (see Overview UniPlot Data Files).