Excecute computation on push button

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To Tran Luan
To Tran Luan 2021-8-9
回答： Image Analyst 2021-8-10
Hello, i have a problem with Push Button in matlab 2020b
The input was fine but when I assign the push button, the mathematic computation is not executed , please help
the program execute to record the edit 1 to 6 is fine, but the value of ts,fs,m,c,...etc are not computed when i push the button, what happen here?
function varargout = GUI(varargin)
% GUI MATLAB code for GUI.fig
% Last Modified by GUIDE v2.5 09-Aug-2021 14:32:49
function edit1_Callback(hObject, eventdata, handles)
fc = str2double(get(handles.edit1,'String'));
assignin('base','fc',fc);
function edit2_Callback(hObject, eventdata, handles)
fm = str2double(get(handles.edit2,'String'));
assignin('base','fm',fm);
function edit3_Callback(hObject, eventdata, handles)
fd = str2double(get(handles.edit3,'String'));
assignin('base','fd',fd);
function edit4_Callback(hObject, eventdata, handles)
B = str2double(get(handles.edit4,'String'));
assignin('base','B',B);
function edit5_Callback(hObject, eventdata, handles)
Am = str2double(get(handles.edit5,'String'));
assignin('base','Am',Am);
function edit6_Callback(hObject, eventdata, handles)
Ac = str2double(get(handles.edit6,'String'));
assignin('base','Ac',Ac);
function pushbutton1_Callback(hObject, eventdata, handles)
global fc fm fd B Am Ac;
ts = 1/(10*fc);
fs= 1/ts;
t = 0:1/fs:0.5;
m=Am*cos(2*pi*fm*t); %message
c=Ac*cos(2*pi*fc*t); %carrier
y= fmmod(m,fc,fs,fd); %modulated
z= fmdemod(y,fc,fs,fd); %demodulated
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To Tran Luan
To Tran Luan 2021-8-9
thank you, i need help with the pushbutton, it seem something wrong because when i push the button , it doesnt execute the
ts = 1/(10*fc);
fs= 1/ts;
t = 0:1/fs:0.5;
m=Am*cos(2*pi*fm*t); %message
c=Ac*cos(2*pi*fc*t); %carrier
y= fmmod(m,fc,fs,fd); %modulated
z= fmdemod(y,fc,fs,fd); %demodulated
Rik
Rik 2021-8-9
What is your evidence for that code not executing? Note that it is a function and has its own workspace. You will not (and should not) see anything happen in the base workspace.

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回答（2 个）

Jan
Jan 2021-8-9
With
assignin('base','Ac',Ac);
you create the variable Ac in the base workspace. If you do not declare this variable as global in the base workspace before, it is existing there, but not a global. Then:
function pushbutton1_Callback(hObject, eventdata, handles)
global fc fm fd B Am Ac
creates Ac as global variable, but this does not copy the value from the base workspace, when it wasn't a global there.
Global variables and assignin are really bad choices to distribute variables. Mixing them is even more confusing.
A clean usage of a GUI will store the variables internally, e.g. in the figure's UserData or in the handles struct.
function varargout = GUI(varargin)
% GUI MATLAB code for GUI.fig
% Last Modified by GUIDE v2.5 09-Aug-2021 14:32:49
function edit1_Callback(hObject, eventdata, handles)
handles.fc = str2double(get(handles.edit1,'String'));
guidata(hObject, handles);
function edit2_Callback(hObject, eventdata, handles)
handles.fm = str2double(get(handles.edit2,'String'));
guidata(hObject, handles);
... and so on
function pushbutton1_Callback(hObject, eventdata, handles)
ts = 1/(10*handles.fc);
fs= 1/handles.ts;
t = 0:1/handles.fs:0.5;
m=Am*cos(2*pi*handles.fm*handles.t); %message
c=Ac*cos(2*pi*handles.fc*handles.t); %carrier
y= fmmod(m,handles.fc,fs,handles.fd); %modulated
z= fmdemod(y,handles.fc,fs,handles.fd); %demodulated
end
Then you can run 2 GUIs in parallel ithout any confusions, because the valiues are store inside the figure.
An alternativ is to declare the variables as globals:
function edit1_Callback(hObject, eventdata, handles)
global fc
fc = str2double(get(handles.edit1,'String'));
end
function edit2_Callback(hObject, eventdata, handles)
global fm
fm = str2double(get(handles.edit2,'String'));
end
... and so on
function pushbutton1_Callback(hObject, eventdata, handles)
global fc fm fd B Am Ac
ts = 1/(10*fc);
fs= 1/ts;
t = 0:1/fs:0.5;
m=Am*cos(2*pi*fm*t); %message
c=Ac*cos(2*pi*fc*t); %carrier
y= fmmod(m,fc,fs,fd); %modulated
z= fmdemod(y,fc,fs,fd); %demodulated
end
Then there is no indirection over the base workspace anymore, but running 2 GUIs would not work, because they share the same values again.
Image Analyst
Image Analyst 2021-8-10
@To Tran Luan, set a breakpoint and see if it gets inside the callback.
Debugging in MATLAB | Doug's MATLAB Video Tutorials
If it doesn't, check the Tag in GUIDE to make sure it has exactly the same name as the callback function, but with _Callback added to it. Because chances are, if it doesn't go in there, that the names are different.

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