inverce laplace and ploting data

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ali akyuz 2020-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/525825-inverce-laplace-and-ploting-data

评论： Star Strider 2020-6-1

I need to verify this figure by obtaining poles and c(t) from G(s) and plotting unit step response for each case. But I couldn't go to the inverse laplace. where am i doing wrong ?

s = zpk('s')
Gs=(9)/(s^2+9*s+9);
pole(Gs)
zero(Gs)
Ct=ilaplace(Gs)
figure
plot(Ct)

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Rena Berman 2020-6-1

(Answers Dev) Restored edit

Star Strider 2020-6-1

Thank you.

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回答（1 个）

Star Strider 2020-5-16

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I believe that what you actually want is:

s = zpk('s')
Gs=(9)/(s^2+9*s+9);
pole(Gs)
zero(Gs)
% Ct=ilaplace(Gs)
figure
step(Gs)

since under other circumstances (specifically using the Symbolic Math Toolbox), plotting ilaplace of a symbolic transfer function (using fplot) would return the impulse response. To plot a symbolic step response, you would divide ‘Gs’ by ‘s’, then use fplot.