how to calculate absolute value for a tf-object for a certain frequency

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Anders Hultgren
Anders Hultgren 2019-5-23
评论： Star Strider 2019-5-23
how to calculate absolute value for a tf-object for a certain frequency.
i.e. I have a transfer function object, tf. I would like to calculate the absolute value and the angle of the transfer function for a certain frequency.
Anders

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Star Strider
Star Strider 2019-5-23
Thje evalfr (link) function is likely what you want.
It requires a complex radian frequency for the frequency argument, so for example 100 Hz would be 2*pi*1j*100. You can get the magnitude of the complex output with the abs function, and the radian phase angle with the angle function.

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