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Thread Subject: Matlab outputing wrong transfer function?

Subject: Matlab outputing wrong transfer function?

From: Jason D

Date: 19 Oct, 2009 18:22:35

Message: 1 of 2

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I was testing Simulink and I placed a 'du/dt' block between and input and output block, then ran

[A,B,C,D] = linmod('system')
[num, den] = ss2tf(A,B,C,D)

this returns the transfer function as 0/1. Shouldn't it be s/1 ?

Subject: Matlab outputing wrong transfer function?

From: Phil Goddard

Date: 19 Oct, 2009 19:40:19

Message: 2 of 2

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Open the derivative block and press the Help button to read the doc.
It explains why the derivative is zero, and has links to several topics related to why you should avoid using derivative blocks and how you may be able to change your model to avoid them.

Phil.

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Tag Activity for This Thread
Tag	Applied By	Date/Time
simulink	Phil Goddard	19 Oct, 2009 15:44:07
linmod	Phil Goddard	19 Oct, 2009 15:44:07
derivative block	Phil Goddard	19 Oct, 2009 15:44:07

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