lsim giving NaN output for zero input

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shubha t r 2019-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/464128-lsim-giving-nan-output-for-zero-input

评论： shubha t r 2019-5-28

Hi,

I have a system with frequency and phase response as shown. The system is unstable with one pole on the right half of s-plane. If input is x=[0 0 0] output through lsim is NaN. How can this issue be solved ? Please help. Thank you.

Zeros=(-37436128.4318415 + 29344189.3569776i , -37436128.4318415 - 29344189.3569776i , -4398673.13805009 + 4099882.75353130i , -4398673.13805009 - 4099882.75353130i, -632969.549556042 + 0.00000000000000i)

Poles=( -1105299964.29975 + 0.00000000000000i, -102844523.541346 + 0.00000000000000i, -23575505.1105442 + 30425526.2059357i, -23575505.1105442 - 30425526.2059357i, 24762584.8470421 + 0.00000000000000i)

Gain k = -8.8777e+04

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采纳的回答

Raj 2019-5-27

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I am getting zero output for zero input if that's what you are looking for. Check how you are using lsim.

Zeros=[-37436128.4318415 + 29344189.3569776i  , -37436128.4318415 - 29344189.3569776i , -4398673.13805009 + 4099882.75353130i ,  -4398673.13805009 - 4099882.75353130i,  -632969.549556042 + 0.00000000000000i];
Poles=[ -1105299964.29975 + 0.00000000000000i, -102844523.541346 + 0.00000000000000i, -23575505.1105442 + 30425526.2059357i,  -23575505.1105442 - 30425526.2059357i,  24762584.8470421 + 0.00000000000000i];
k = -8.8777e+04;
sys=zpk(Zeros,Poles,k) % Define your system
t=0:0.1:1; % lets say we run the simulation for 1 second
x=zeros(1,numel(t)); % all zero input till end of simulation
lsim(sys,x,t)