ss2tf give different results depending on version of MATLAB

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Philip
Philip 2013-9-25
编辑： Walter Roberson 2013-10-3
I use Matlab version 8.2 and my friend 7.14 we get different result using this code
A=[0 1 0 0; -(1.19/1.7e-3) -((8.39e-3)/320)^2/(3.21*1.7e-3) (1.19/1.7e-3) 0; 0 0 0 1; (1.19/4.8e-3) 0 -(1.19/4.8e-3) 0];
B=[0;8.39e-3/(3.21*1.7e-3*320); 0; 0];
C=[0 1 0 0];
D=0;
[n,d]=ss2tf(A,B,C,D);
transfun = tf(n,d)
We get different transfer function and different variable n. Why is that?

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回答（1 个）

Craig
Craig 2013-10-3
Over releases algorthims are updated to improve reliability and accuracy of computations. As a result answers can differ between releases.

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