How to use matlab to calculate a gain, to a specific limit of a transfer function?

Question

Yuehan Zhang 2020-10-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/610381-how-to-use-matlab-to-calculate-a-gain-to-a-specific-limit-of-a-transfer-function

回答： Paul 2020-10-11

The equation is like the pic shown, matlab kept popping up that I can’t use limit within tf. Just wondering how do I use matlab to get the k value

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

VBBV 2020-10-11

编辑：VBBV 2020-10-11

See the solution explained on below link...on how to apply limits on tfdata

https://in.mathworks.com/matlabcentral/answers/569376-how-to-find-the-limit-of-a-transfer-function-defined-using-tf

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Paul 2020-10-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/610381-how-to-use-matlab-to-calculate-a-gain-to-a-specific-limit-of-a-transfer-function#answer_510691

在 MATLAB Online 中打开

You can use

evalfr(minreal(sys),f)

f is the complex frequency to which you want to take the limit. The minreal is to make sure you cancel common poles and zeros before taking the limit. Be careful if you have poles and zeros that should cancel but don’t because they aren’t quite numerically the same.