Plot graph in App Designer
显示 更早的评论
I need to plot a graph with the 2 axes being gain and frequency. The code is as below but I can't plot it since my gain is not numeric. How else should I plot it?
% Button pushed function: LOWPASSFILTERButton
function LOWPASSFILTERButtonPushed(app, event)
% INPUT USED
% R = Resistance (Ohms)
% f = Frequency (Hz)
% C = Capacitance (C)
% OUTPUT
% H(s) = Gain
% To check selection for resistance
selection = app.ResistanceOhmsDropDown.Value;
% To assign a value to the selections
if selection == '1k'
value = 1;
elseif selection == '2k'
value = 2;
elseif selection == '3k'
value = 3;
elseif selection == '4k'
value = 4;
end
% Conditions for each selections
switch value
case 1
% specify inputs
R = 1000;
f = app.CutoffFrequencyHzEditField.Value;
C = 1/(2*pi*R*f);
% Calculate gain
gain = tf(1,1+(2*pi*R*C));
% plot graph
plot(app.UIAxes,gain,f);
end
采纳的回答
Walter Roberson
2022-5-22
Change
plot(app.UIAxes,gain,f);
to
bodeplot(app.UIAxes, gain, {0,f} );
6 个评论
Ye Ken Kok
2022-5-22
It displays an error
Walter Roberson
2022-5-22
That is a nuisance. You will need to do something like
[mag, phase, w] = bode(gain, {1, f});
That will return the magnitude and phase responses, and the frequencies corresponding. Normally magnitude and phase would be in separate plots, but you can proceed to plot(app.UIAxes, w, mag) and do whatever is suitable for the phase.
Ye Ken Kok
2022-5-22
Well I tried what you said, but it showed another error stating that the data should not have 2 dimensions
%setup for demo purposes
app.UIFigure = figure(); %uifigure();
app.UIFigure.Position = [100 100 1222 499];
app.UIAxes = uiaxes(app.UIFigure);
f = 50;
%end setup for demo
R = 1000;
C = 1/(2*pi*R*f);
gain = tf(1, 1+(2*pi*R*C))
[mag, phase, w] = bode(gain, {1, f});
plot(app.UIAxes, w, squeeze(mag), 'DisplayName', 'magnitude')
hold(app.UIAxes, 'on');
plot(app.UIAxes, w, squeeze(phase), 'DisplayName', 'phase');
legend show
Ye Ken Kok
2022-5-22
After I run the program the graph is plotted on the GUI but the legend appears in another tab
Walter Roberson
2022-5-22
legend(app.UIAxes, 'show')
Note: you are never going to have negative frequencies for this purpose.
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