DCMotorParitySpace:

--------------------------------------------------------------------------
   Computes the residuals for two DC motors.

   Since version 9.
--------------------------------------------------------------------------
   Form:
   [r, q] = DCMotorParitySpace( y, v, dT, plant, q )
--------------------------------------------------------------------------

   ------
   Inputs
   ------
   y              (2,1)  Measurements
   v              (2,1)  Stochastic unknown disturbances
   dT             (1,1)  Time step (sec)
   plant          (1,1)  Plant model data structure
                         .a  (n,n) Plant
                         .b  (n,m) Input matrix
   q              (1,1)  Data structure for measurements and inputs
                         .yS (4,1) Measurements
                         .uS (2,1) Inputs

   -------
   Outputs
   -------
   r            (2,1)  Residual
   q            (1,1)  Data structure for measurements and inputs
                       .yS (4,1) Measurements
                       .uS (2,1) Inputs

--------------------------------------------------------------------------