How to plot multiple curves in the same graph window?
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I want to plot graphs for multiple Kp values for a proportional controller. I tried using for loop to perform this. But I didn't get the output.Below, I attach the code which I have written for your reference. Please guide me on this. If you can tell me if there's any other way to do it, then that would be great.
Kindly reply asap.
Thank you.
5 个评论
dpb
2020-3-15
Just paste short demo code as text, use the code button to format ... much easier than having to download a file and open it externally.
For figures, SaveAs a .jpg and then attach the immage with the picture icon at the INSERT group.
I'll guess just from the words you didn't use "hold on" after the first plot to add subsequent to the same axes...
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Star Strider
2020-3-15
Try this:
J=20.48*10e-6;
b=0.702;
kt=14.70;
kb=0.48;
R=1.6;
L=0.02*0.001;
num=kt;
den=[(J*L) ((J*R)+(L*b)) ((b*R)+(kb*kt))];
kp=0:50:300; %plotting graph for P controller with Kp values in steps of 50
for k = 1:numel(kp)
ki=0;
kd=0;
numc=[kd,kp(k),ki];
denc=[0 1];
numa=conv(num,numc);
dena=conv(den,denc);
[numac,denac]=cloop(numa,dena);
sys = tf(numac,denac)
[y{k},t{k}] = step(sys);
% QL(k,:) = [min(y{k}), max(y{k})] % Information
end
figure
hold on
for k = 2:numel(y)
plot(t{k}, y{k})
end
hold off
xlabel('time(sec)'), ylabel('velocity(rad/sec)')
title ('pid control');
grid
It is necessary to create a system object to use the step funciton. The first step output is uniformly zero, and that causes problems with the plot. Start with the second one instead.
Also, use feedback rather than cloop (that has been deprecated).
8 个评论
Star Strider
2020-3-16
To change the axis limits use the xlim, ylim or axis functions. To set limits on axes that are already plotted, see the documentation on Axes Properties.
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