Write value to entry in attribute with global scope

Input Arguments

cdfId

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

attrNum

Number identifying attribute. Attribute numbers are zero-based. The attribute must have global scope.

entryNum

Number identifying entry. Entry numbers are zero-based.

CDFdatatype

One of the following text strings that specify the data type of the attribute entry, or its numeric equivalent.

CDF Data Type MATLAB Equivalent

CDF_BYTE 1-byte, signed integer

CDF_CHAR 1 byte, signed character data type that maps to the MATLABchar class

CDF_INT1 1-byte, signed integer.

CDF_UCHAR 1 byte, unsigned character data type that maps to the MATLABuint8 class

CDF_UINT1 1-byte, unsigned integer

CDF_INT2 2-byte, signed integer

CDF_UINT2 2-byte, unsigned integer.

CDF_INT4 4-byte, signed integer

CDF_UINT4 4-byte, unsigned integer

CDF_FLOAT 4-byte, floating point

CDF_REAL4 4-byte, floating point

CDF_REAL8 8-byte, floating point.

CDF_DOUBLE 8-byte, floating point

CDF_EPOCH 8-byte, floating point

CDF_EPOCH16 two 8-byte, floating point

entryVal

Data to be written to global attribute entry.

Examples

Create a CDF and create a global attribute in the file. Write a value to an entry in the attribute. 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 a global attribute in the file. attrNum = cdflib.createAttr(cdfid,'Purpose','global_scope'); % Write a value to an entry for the global attribute cdflib.putAttrgEntry(cdfid,attrNum,0,'CDF_CHAR','My Test'); % Get the value of the global attribute entry value = cdflib.getAttrgEntry(cdfid,attrNum,0) value = My Test % Clean up cdflib.delete(cdfid); clear cdfid

Tutorials