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As the title states I'm trying to plot a function (or two actually), while a variable changes at different variables. The program just continues to run and doesn't actually stop so it's stuck somewhere and I can't figure out where. Also would this work once it's able to complete? I don't like having the beta inside the loop, but get an error whiles outside.

clear all

clc

L_phi = -2.729;

L_sigma_a = -43.692;

lambda = L_phi;

tau = 1/L_phi;

t = [0:0.01:5];

for t <= 5

if t < 2.5

sigma_a = -3;

elseif t >=2.5

sigma_a = 0;

for beta = (L_sigma_a/L_phi).*sigma_a;

phidot = beta.*(1-exp(lambda.*t));

phi = beta.*(t-1/tau.*exp(tau.*t));

end

end

end

figure(1)

plot(t,phidot)

title('phidot vs time')

xlabel('seconds')

ylabel('degrees')

figure(2)

plot(t, phi)

title('phi vs time')

xlabel('seconds')

ylabel('degrees')

Unrecognized function or variable 'phidot'.

Error in HW1MAE503 (line 23)

plot(t,phidot)

VBBV
on 29 Jan 2021

clear all

clc

L_phi = -2.729;

L_sigma_a = -43.692;

lambda = L_phi;

tau = 1/L_phi;

t = [0:0.01:5];

for i = 1:length(t)

if t(i) < 2.5

sigma_a = -3;

elseif t(i) >=2.5

sigma_a = 0;

end

beta = (L_sigma_a/L_phi)*sigma_a;

phidot(i) = beta*(1-exp(lambda*t(i)));

phi(i) = beta*(t(i)-1/tau*exp(tau*t(i)));

end

figure(1)

plot(t,phidot)

title('phidot vs time')

xlabel('seconds')

ylabel('degrees')

figure(2)

plot(t, phi)

title('phi vs time')

xlabel('seconds')

ylabel('degrees')

May be this is what you want ...

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