[racket] A control-theory question

From: Danny Yoo (dyoo at cs.wpi.edu)
Date: Wed Nov 24 16:00:11 EST 2010

>> Start with a proportional controller (like Noel's suggestion), if it
>> doesn't *quite* get you to the set point and that steady state error
>> is an issue, add in the I and D terms.

Followup: that was very beautiful.  It works wonderfully.  Here's the patch:


I got to get rid of a lot of red code and replace it with a petite 12
lines of green code.  :)

Thanks again!

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