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Delete entry in global attribute




cdflib.deleteAttrgEntry(cdfId,attrNum,entryNum) deletes an entry from a global attribute in a Common Data Format (CDF) file.

Input Arguments


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


Numeric value that identifies the attribute. Attribute numbers are zero-based. The attribute must have global scope.


Numeric value that specifies the entry in the attribute. Entry numbers are zero-based.


Create a CDF and create a global attribute in the file. Write a value to an entry for the attribute and then delete the entry. To run this example, you must be in a writable folder.

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

% Initially the file contains no attributes, global or variable.
info = cdflib.inquire(cdfid)

info = 

     encoding: 'IBMPC_ENCODING'
     majority: 'ROW_MAJOR'
       maxRec: -1
      numVars: 0
    numvAttrs: 0
    numgAttrs: 0

% Create an attribute with global scope in the file.
attrNum = cdflib.createAttr(cdfid,'my_global_attr','global_scope');

% Write a value to an entry for the attribute
cdflib.putAttrgEntry(cdfid,attrNum,0,'CDF_CHAR','My global attr');

% Get the value of the global attribute entry
value = cdflib.getAttrgEntry(cdfid,attrNum,0)

value =

My global attr

% Delete the entry

% Now try to view the value of the entry
% Should return NO_SUCH_ENTRY failure.
value = cdflib.getAttrgEntry(cdfid,attrNum,0)  % Should fail

% Clean up

clear cdfid


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

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