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Specify how variable handles sparse records




cdflib.getVarSparseRecords(cdfId,varNum,stype) specifies the sparse records type of a variable in a Common Data Format (CDF) file.

Input Arguments


Identifier of a CDF file, returned by a call to cdflib.create or


Number that identifies the variable to be set. Variable numbers are zero-based.


One of the following character vectors, or its numeric equivalent, that specifies how the variable handles sparse records.

Value Description
'NO_SPARSERECORDS'No sparse records
'PAD_SPARSERECORDS'For sparse records, the library uses the variable's pad value when reading values from a missing record.
'PREV_SPARSERECORDS'For sparse records, the library uses values from the previous existing record when reading values from a missing record. If there is no previous existing record, the library uses the variable's pad value.

To get the numeric equivalent of the constants specified by these character vectors, use the cdflib.getConstantValue function.


Open a multifile CDF and close a variable.

Create a CDF, create a variable, and set the sparse records type of the variable. To run this example you must be in a writable folder.

cdfid = cdflib.create('your_file.cdf');

% Create a variable in the file.
varNum = cdflib.createVar(cdfid,'Time','cdf_int1',1,[],true,[]);

% Set the sparse records type of the variable

% Check the sparse records type of the variable
stype = cdflib.getVarSparseRecords(cdfid,varNum)

stype =


%Clean up

clear cdfid


This function corresponds to the CDF library C API routine CDFsetzVarSparseRecords.

To use this function, you must be familiar with the CDF C interface. Read the CDF documentation at the CDF website.

For copyright information, see the cdfcopyright.txt file.

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