keep excel file open until its closed in matlab

You can use the actxserver function to create an instance of Excel in MATLAB and then use the invoke method of the Excel object to open the file and keep it open until it is closed manually.

Here's an example code snippet:

main.m
% create an instance of Excel
ex = actxserver('Excel.Application');

% open the file
workbook = ex.Workbooks.Open('path_to_file.xlsx');

% keep Excel open until it is closed manually
% this will display an alert window to remind you to close Excel
ex.Visible = true;
ex.Quit();

% release the resources used by the Excel object
release(ex);
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Note that you should always release the resources used by the Excel object by calling the release function. Also, make sure to replace 'path_to_file.xlsx' with the actual path to the Excel file you want to open.