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How can I plot all iterations of my for loop?

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Lina Alami
Lina Alami 2020년 11월 16일
댓글: Lina Alami 2020년 11월 17일
Hey I'm kind of new to MALAB, so bear with me please!
I'm trying to plot the real and imaginary parts of the eigenvalue results in my for loop, as a function of I from [0,4].
Here's my code:
figure
hold on
for I = 0:0.1:4
p = [-1/3 0 -1 (I-2)]
r = roots(p)
x = r(3)
A = [(1 - x^2) -40 ; 1/800 -1/40]
e = eig(A)
plot(I,real(e(1)),'r-',I,imag(e(1)),'b-')
end
My plot keeps coming up empty, and no error shows up. what can i do?

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gonzalo Mier
gonzalo Mier 2020년 11월 17일
Right now, each plot is plotting only one point. To achieve the behavior you want, create the vectors and plot them outside the for loop
figure
hold on
e=[];
for I = 0:0.1:4
p = [-1/3 0 -1 (I-2)]
r = roots(p)
x = r(3)
A = [(1 - x^2) -40 ; 1/800 -1/40]
e = [e,eig(A)]
end
plot(0:0.1:4,real(e(1,:)),'r-',0:0.1:4,imag(e(2,:)),'b-')

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