Use the Data property of the uitable
data = get(handles.uitable1,'Data')
There's no telling (based on the code we can see) what the class of Data is.
If it's a numeric matrix, you can use it in your calculation directly.
If it's a cell array of character vectors, you can try to do str2double on it and then use that.
If it's something else, you'll have to do something else.
