MATLAB: Plot not appearing in the axes

axesgraphguiplot

I have this code for the callback of my button which is tasked to solve and graph. But when I try it, the plot doesn't appear in the axes. What did I do wrong?
Here's the code:
function button_Callback(hObject, eventdata, handles)
global Yo K r t Y T Y2
% hObject    handle to button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of button
Yo= str2double(get(handles.value_Yo, 'string'));
K= str2double(get(handles.value_K, 'string'));
r= str2double(get(handles.value_r, 'string'));
t= str2double(get(handles.value_t, 'string'));
Y= (K*Yo)/((K-Yo)*exp(-r*t)+Yo);
set(handles.ans, 'string', Y);
for T= 0:0.5:t;
Y= (K*Yo)/((K-Yo)*exp(-r*T)+Yo);
set(handles.axes1);
plot(T,repmat(Y,1,numel(T)),'o');
xlabel ('t(time)');
ylabel ('Y(population)')
end

Best Answer

The call
set(handles.axes1);
fetches the list of public properties that are available to be set for handles.axes1. The list of properties is then discarded because they are not assigned to anything and because you have a semi-colon at the end of the line to supress output.
In particular, the call does not make that axes the "active" axes, so the following plot() call will go to whichever axes happens to have last been activated.
Also, you do not have a "hold on", so every plot() call is erasing the previous plot.
I recommend that you read https://www.mathworks.com/matlabcentral/answers/317181-non-deterministic-behavior-with-multiple-figures#answer_247493
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