DCMotorFailures:

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   Triggers a failure at time tFail. Sets the failed parameter to pFail.

   Since version 9.
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   Form:
   [c, d] = DCMotorFailures( failure, t, dT, c, d, tFail, pFail )
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   ------
   Inputs
   ------
   failure        (1,:)  Failure type
   t              (1,1)  Time
   dT             (1,1)  Time step (sec)
   c              (5,4)  State output matrix
   d              (1,1)  Motor structure
                         .beta  (2,1) Rate feedback
                         .alpha (2,1) Input voltage scaling
   tFail          (1,1)  Time of failure
   pFail          (1,1)  Set the failed parameter to this value

   -------
   Outputs
   -------
   c              (5,4)  State output matrix
   d              (1,1)  Motor structure

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