LTI data extraction

Question

Ryan0101 2012-3-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/33260-lti-data-extraction

Hello,

I have a continuous simulink model with mulitple transfer functions that I put into the LTI toolkit, but I would like to extract the bode plot (Magnitude and phase) into variable names so I can compare it to a discrete version I wrote. Is there a way to extract the data? or should I not use LTI and go about it differently?

Thanks

here is the LTI code I used:

mdl = 'MODEL_Continuous';   % set to file name of simulink model
io = getlinio(mdl)         % get i/o signals of mdl
op = operspec(mdl)
op = findop(mdl,op)        % calculate model operating point
lin = linearize(mdl,op,io) % compute state space model of lin sys
ltiview(lin)

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Answer 1

Jarrod Rivituso 2012-3-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/33260-lti-data-extraction#answer_41864

在 MATLAB Online 中打开

I believe you can use the bode function for that...

[mag,phase,freqs] = bode(lin)

Also, if you are comparing two systems, you might want to actually specify the frequencies of interest

%Create frequency vector with 100 points between 10^-1 .. 10^2
freqs = logspace(-1,2,100);
%Get bode output at those frequencies
[mag,phase] = bode(lin,freqs)

Hope this helps!