On Tue, Jan 30, 2018 at 5:18 AM, Beginner1 <address@hidden> wrote:
In fact, what is happening is the dispersión of the "O" marker for zero
locations as soon as the poles trajectories converge at the real axis:
Kp=1.5, Ki=940
<http://octave.1599824.n4.nabble.com/file/t372684/1st. >jpg
Kp=1.5, Ki=960
<http://octave.1599824.n4.nabble.com/file/t372684/2nd. >jpg
when changing the value of Ki from 940 to 960 in this code:
/ pkg control load
ki=960;
kp=1.5;
w=314.159;
num=([kp ki kp*w.^2]);
den=([1 0 w.^2]);
sis=tf(num,den);
%[RLDATA, ki] = rlocus (sis, 1, 0, 40);
%plot(rlocus(sis),"*","markersize",1)
rlocus(sis)
nr=roots(num);
dr=roots(den);
hold on
plot(nr,"co","markersize",15)
plot(dr,"rx","markersize",15)
Change to plot commands to
plot(real(nr), imag(nr),"co","markersize",15)
plot(real(dr),imag(dr),"rx","markersize",15)
hold off/
So can anybody give me advice on how to avoid this movement of the zero
marker?
Thank you
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