DCMotorParitySpace:

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   Computes the residuals for two DC motors.
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   Form:
   [r, q] = DCMotorParitySpace( y, v, dT, plant, q )
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   Inputs
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   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

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

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