# How can I plot all iterations of my for loop?

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Lina Alami il 16 Nov 2020
Commentato: Lina Alami il 17 Nov 2020
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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### Risposta accettata

gonzalo Mier il 17 Nov 2020
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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Lina Alami il 17 Nov 2020
Thank you so much!!

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