How to adjust value from matlab-mfile and feedback in simulink

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I am having a model in simulink uploaded at:
<http://www.freeimagehosting.net/79moh. >
In the first iteration the model should take value from matlab mfile and calculate error for Pid as e=r-i where 'i' is the value taken from matlab mfile but after that it should take feedback and calculate the error as e=r-y where 'y' is the value of feedback from space state. How can I do that in simulink. Any guidance?

Accepted Answer

Muruganandham Subramanian
Edited: Muruganandham Subramanian on 5 Dec 2012
step1:Initialize all i/p data in m-file & variable 'i'
step2: use 'sim()' command to run your model
step3: store the value of 'y' in baseworkspace by 'To workspace' block from model
step4:calculation
  8 Comments
Muruganandham Subramanian
Initial condition in unit delay is user specified. so you can give any value like 0 or 2 or 5 or etc...

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