The CDF_OPEN function opens an existing Common Data Format file.
Result = CDF_OPEN(Filename)
If successful, the CDF ID for the file is returned.
A scalar string containing the name of the file to be created. Note that if the desired filename has a
.cdf ending, you can omit the extension and specify just the first part of the filename. For example, specifying "mydata" would open the file
id = CDF_OPEN('open_close.cdf') ; Open a file. ; ... other CDF_ commands ... CDF_CLOSE, id ; Close the cdf file.
Introduced: Pre 4.0