How to Plot Inverse Laplace with Heaviside?

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Anthony Aquino
Anthony Aquino 2023-11-14
回答： Star Strider 2023-11-14
Hello. I want to plot an inverse laplace transform using simple MATLAB functions however, I get an error message when I try to. Does this have to do with the heaviside functions? The equation is provided below:
clc
syms s t
Q = 10/(s*(s^2+100*s+1600))-10*exp(-3*s)/(s*(s^2+100*s+1600));
pretty(Q)
q = ilaplace(Q);
pretty(q)
plot(t,q)

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采纳的回答

Star Strider
Star Strider 2023-11-14
Ran in:
Use the fplot function —
clc
syms s t
Q = 10/(s*(s^2+100*s+1600))-10*exp(-3*s)/(s*(s^2+100*s+1600));
pretty(Q)
10 exp(-3 s) 10 --------------------- - --------------------- 2 2 s (s + 100 s + 1600) s (s + 100 s + 1600)
q = ilaplace(Q)
q = 
pretty(q)
exp(-80 t) exp(-20 t) / exp(240 - 80 t) exp(60 - 20 t) 1 \ 1 ---------- - ---------- - heaviside(t - 3) | --------------- - -------------- + ---- | 10 + --- 480 120 \ 4800 1200 1600 / 160
figure
fplot(q, [0 5])
grid
xlabel('t')
ylabel('q(t)')
axis('padded')
.

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