How do i augment a matrix with user input

I am making an ATM machine with importing an excel file. After user selects to add or withdraw money, it doesn't change the balance in the matrix. It stays the same as the original data, is there anyway to change one matrix by augmenting?

[Jan]

Yes.

If you want are more specific answer, please edit the question and add any details.

[Joseph Cheng]

depending on what you're doing see that you're writing the excel file after the transaction, or use the debug tool to see if you're augmenting the matrix to be written to the file properly.

[Vandana Ravichandran]

Is the ATM Machine designed in MATLAB? After importing excel data and processing, make sure to write the new data back to excel. Check if you are getting any errors in the process. Please add further details of your design to your question, for suggestions.