How to get a transfer function of a Simulink Block (a Subsystem) besides Model Linearizer?

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Wenqing Qiu 2020-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/523362-how-to-get-a-transfer-function-of-a-simulink-block-a-subsystem-besides-model-linearizer

Hallo, i need a transfer fcn of a Block (a Susystem, with a interpreted matlab fcn and integrator), but with the methode i found, Model Linearizer, i got always strange results, not at all what i wanted. And when i tried to use Model Linearizer doing simple examples (even also with a simple interpreted matlab fcn and integrator), it worked well, i'm confused.

So i want to ask is there any other way to get a transfer fcn, has anybody a better idea?

What i got: