When XLSWRITE is used to write to cells in a spreadsheet, by default it overwrites the existing data in the cells. Thus deleting the existing values in a certain cell area can also be accomplished by writing empty cells.
The following example shows how to use the XLSWRITE command to write an empty cell to a cell area in order to clear the existing values:
xlswrite('test.xls', cell(29, 1), 'Table1', 'A3:A31');
