Executing an Excel Add in from MATLAB

I am having issues executing an excel add in within a MATLAB script. I want to execute the excel add in (.xla) that requires an input function, and return the results from the add in on each iteration of a FOR loop into an array of values. I have been able to open excel and initiate the process using the actxserver(Excel.Application) function.

This is the basic modified code to activate the excel communication from the function reference:

e = actxserver('Excel.Application');
eWorkbook = e.Workbooks.Add;
e.Visible = 1;
eSheets = e.ActiveWorkbook.Sheets;
eSheet1 = esheets.get('Item', 1);
eSheet1.Activate;

eActiveSheetRange = e.ActiveSheet.get('Range', 'A1');

A = 'Add-in Function Input';

% Send add in input function to excel cell
eActiveSheetRange.Value = A;

% Return Add-in output and display 
eActiveSheetRange.Value

Quit(e);
delete(e);

Using the add in within excel with the add in running would just require entering "=add in function" in cell A1 and the result of the add-in would return to cell A1. I want to simulate this process from MATLAB. So far I have been able to get excel open and the input for the macro is entered into cell A1, but the Add in is not executed and therefore the output not returned to MATLAB.

Any suggestions for executing this would be greatly appreciated. Also if there is a way to directly execute the add-in file (sending the function inputs and returning the output) without going through the excel interface that would be the preferred method.