Plot gain vs frequency (GUI)

The capacitor result is working

But the plot is giving an error and cannot draw gain vs freq

This is the code:

function calculate_button_Callback(hObject, eventdata, handles)

option = get(handles.r_values, 'value');

switch option

case 1

R = 1000;

case 2

R = 2000;

case 3

R = 3000;

case 4

R = 4000;

end

f_c = get(handles.fc_value,'string');

f_c = str2double(f_c);

c_value = 1 / (2*pi*R*f_c);

c_value = num2str(c_value);

set(handles.cap_result,'string',c_value);

function plotbutton_Callback(hObject, eventdata, handles)

r_value1 = get(handles.r_values,'value');

switch r_value1

case 1

R = 1000;

case 2

R = 2000;

case 3

R = 3000;

case 4

R = 4000;

end

c_value1 = get(handles.cap_result,'string');

if get(handles.highbutton,'string') == 1

Gain = tf(R*c_value1,1 + R*c_value1);

bode(Gain)

elseif get(handles.lowbutton,'string') == 1

Gain = tf(1,1 + R*c_value1);

bode(Gain)

end

Answer 1

[Voss]

If you have the Control System Toolbox or the System Identification Toolbox, you can try using bodeplot instead of bode, which will allow you to specify the (UI)Axes to plot into and other options.

References:

https://www.mathworks.com/help/control/ref/lti.bodeplot.html

https://www.mathworks.com/help/ident/ref/lti.bodeplot.html

(They seem to be the same function in two different toolboxes, judging by their documentation pages.)

[Badr Al-Sabri]

I tried this, but the function didn't plot anything

See the code so your vision can be complete, maybe the error is simple

Thanks for helping

[Voss]

You should be getting the Value property of the radiobuttons, not the String property, in plotbutton_Callback:

if get(handles.highbutton,'Value') == 1
     Gain = tf(R*c_value,1 + R*c_value);
     axes(handles.axes1);
     h = bodeplot(Gain);
elseif get(handles.lowbutton,'Value') == 1
     Gain = tf(1,1 + R*c_value);
     axes(handles.axes1);
     h = bodeplot(Gain);
end

[Badr Al-Sabri]

Thanks Bro, this worked perfectly.

[Voss]

Great! You're welcome!