how to write PID function in .m file

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i need a pid function in my m file. could anyone please write the function.
PUJARI MURAGA on 1 Dec 2016
You are having state space model. Suppose I have differential equations then is it possible to do without converting them in state space/laplace ?

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Accepted Answer

Arkadiy Turevskiy
Arkadiy Turevskiy on 14 May 2012
Edited: Arkadiy Turevskiy on 27 Oct 2014
This demo might help.
Arkadiy Turevskiy
Arkadiy Turevskiy on 17 May 2012
well, how many inputs and outputs does you system have? If is a single-input-single output system, then everything shown in the demo is still applicable.If you more comfortable dealing with transfer functions, convert your state space system to a transfer function using tf:

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More Answers (2)

Krishnendu Mukherjee
Krishnendu Mukherjee on 14 May 2012
a way is there : suppose ur tf is (1/a+s) which is to be fed to a pid controler. then the overall tf will be: (Kp+Ki/S+Kd.S).(i/S+a)/(1+(Kp+Ki/S+Kd.S).(i/S+a)). now if you want to give step input then : num=[............] den=[............] tf=num/den ster(tf) so you have to transfer the PID and the tf to a overall transfer function.
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sujan on 17 May 2012
thank you,
but my model is a space state model and its has 9 state parameters. and i dont know how to use PID in my system. and it is a MIMO system. 4 inputs and 9 outputs. so could you please help me to write a PID function for space state form not in tf. thank you

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Daniel on 24 Oct 2014
Please where's the demo? I'm also trying to write a matlab function for pid using the user-defined function block

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