Plot two figures using GUI

I try to create a GUI for my program using this link I have two figures created like this:

       y1 = y1(:,1);

       dt = 1/Fs1;
       t = 0:dt:(length(y1)*dt)-dt;
       plot(t,y1); xlabel('Seconds'); ylabel('Amplitude');

       y2 = y2(:,1);

       dt = 1/Fs2;
       t = 0:dt:(length(y2)*dt)-dt;
       plot(t,y2); xlabel('Seconds'); ylabel('Amplitude');

I inserted two push buttons. Button 1 for creating first figure and button 2 for creating the second one. How can I do that?

Answer 1

[Geoff Hayes]

Rihanna - you would need to put the code to build each figure within the callback for each of your push buttons. Also, you would need to somehow access the y1, y2, Fs1, and Fs2 variables. Where are you populating these variables - from a file or are they entered by the user (through the GUI or some other means)?

If y1, y2, Fs1, and Fs2 are known when you launch the GUI, you could do something like the following in the OpeningFcn

% --- Executes just before simple_gui is made visible.
function simple_gui_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to simple_gui (see VARARGIN)

% Choose default command line output for simple_gui
handles.output = hObject;

% load the y1 and y2 data
y1 = ...;
y2 = ...;

% set the sample rates
Fs1 = ...;
Fs2 = ...;

% now save these variables to the handles structure so that all callbacks
% have access to them
handles.y1  = y1;
handles.y2  = y2;
handles.Fs1 = Fs1;
handles.Fs2 = Fs2;

% Update handles structure
guidata(hObject, handles);

Note the order in the above code - we initialize the variables, set the fields of handles with these new variables, and then update the handles structure using guidata (this order is important).

Now in your pushbutton1 callback, you could do something like

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

y1 = handles.y1(:,1);
dt = 1/handles.Fs1;
t  = 0:dt:(length(y1)*dt)-dt;
plot(t,y1); xlabel('Seconds'); ylabel('Amplitude');

Note that the above will create a new figure with the data that you have plotted. (If your GUI has axes controls that you wish to use to plot the data on, then you can pass the handle to the axes (obtained from handles) to the plot function. See plot(ax,...) for details.)