how to convert state space to tf

Question

jasaswini mohanty 2014-4-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124139-how-to-convert-state-space-to-tf

回答： Azzi Abdelmalek 2014-4-2

here are my matrices a=[-50 -66.67;47.9 -1]; b=[83.33;0]; c=[0 0;0 1]; d=[0;0];

i want to get the the tf from the state space model. when tried to get it with input as 1 got a result which is- [num,den]=ss2tf(a,b,c,d,1)

num =

1.0e+003 *
         0         0         0
         0    0.0000    3.9915

den =

1.0e+003 *
    0.0010    0.0510    3.2435

i am unable to get the answer.

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Answer 1

Azzi Abdelmalek 2014-4-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124139-how-to-convert-state-space-to-tf#answer_131728

From your data we can see that your system has one input (b is mx1) and two output (c is 2xm) then, from input 1 you have two transfer functions. Because c(1,:) is [ 0 0], the first transfer function is equal to 0. The result you've got is correct. What are you expecting as result?