In your pushbutton1_Callback: define a matrix 3 x 3 matrix.
M = zeros(3,3);
count = 0;
for k = 1 : 3
for l = 1 : 3
count = count + 1;
key = ['a' num2str(count)];
val = str2double(get(handles.(key),'String'));
M(l,k) = val;
end
end
set(handles.results,'String',num2str(det(M)));
where a1:a9 are represents tags for each text component assigned in a columnwise manner. GUIDE stores references to each component in the handles structure; this enables easy communication between the components. The hObject in the object's callback represents the current object; that is the object to which the callback is assigned.
So if you ever use guide for your GUIs, then the handles structure is your friend!!!
