Wolfram Language & System 11.0 (2016)|Legacy Documentation

This is documentation for an earlier version of the Wolfram Language.View current documentation (Version 11.2)


is an option for some control system functions that specifies the feedback type.


  • The following settings can be used:
  • "Negative"system with negative feedback
    "Positive"system with positive feedback
    Noneclosed-loop system or system with no feedback
  • "Negative" and "Positive" refer to the value of sgn, which can be - or +.
Introduced in 2010