if excelfile is closed server should be released in matlab

To release the server when the Excel file is closed in MATLAB, you need to call the Quit method on the Excel object. The Quit method closes Excel and releases associated resources. Here's an example code snippet:

main.m
% create Excel object
excel = actxserver('Excel.Application');

% open Excel file
workbook = excel.Workbooks.Open('path/to/file.xlsx');

% do some stuff with the file

% close file and release resources
workbook.Close(false); % false = don't save changes
excel.Quit();
269 chars
12 lines

In this example, we create an Excel object using the actxserver function, open an Excel file using the Workbooks.Open method, do some manipulations on the file, and then close the file using the Close method and the Quit method to release the server. Setting the SaveChanges parameter of the Close method to false ensures that any unsaved changes are not saved before closing.