C
C There are a total of 2 entries in the algebraic variable array.
C There are a total of 3 entries in each of the rate and state variable arrays.
C There are a total of 13 entries in the constant variable array.
C
C
C VOI is time in component environment (day).
C STATES(1) is x1 in component x1 (cell).
C CONSTS(1) is alpha1 in component model_parameters (flux).
C CONSTS(2) is beta1 in component model_parameters (first_order_rate_constant).
C CONSTS(3) is g11 in component model_parameters (dimensionless).
C CONSTS(4) is g21 in component model_parameters (dimensionless).
C STATES(2) is x2 in component x2 (cell).
C CONSTS(5) is alpha2 in component model_parameters (first_order_rate_constant).
C CONSTS(6) is beta2 in component model_parameters (first_order_rate_constant).
C CONSTS(7) is g12 in component model_parameters (dimensionless).
C CONSTS(8) is g22 in component model_parameters (dimensionless).
C STATES(3) is z in component z (percent).
C CONSTS(9) is k1 in component model_parameters (percent_per_cell_per_day).
C CONSTS(10) is k2 in component model_parameters (percent_per_cell_per_day).
C ALGBRC(1) is y1 in component y1 (cell).
C ALGBRC(2) is y2 in component y2 (cell).
C CONSTS(12) is x1_bar in component x1_bar (cell).
C CONSTS(13) is x2_bar in component x2_bar (cell).
C CONSTS(11) is gamma in component model_parameters (dimensionless).
C RATES(1) is d/dt x1 in component x1 (cell).
C RATES(2) is d/dt x2 in component x2 (cell).
C RATES(3) is d/dt z in component z (percent).
C
      SUBROUTINE initConsts(CONSTS, RATES, STATES)
      REAL CONSTS(*), RATES(*), STATES(*)
      STATES(1) = 10.06066
      CONSTS(1) = 3
      CONSTS(2) = 0.2
      CONSTS(3) = 0.5
      CONSTS(4) = -0.5
      STATES(2) = 212.132
      CONSTS(5) = 4
      CONSTS(6) = 0.02
      CONSTS(7) = 1
      CONSTS(8) = 0
      STATES(3) = 100.0
      CONSTS(9) = 0.24
      CONSTS(10) = 0.0017
      CONSTS(11) =  CONSTS(7)*CONSTS(4) -  (1.00000 - CONSTS(3))*(1.00000 - CONSTS(8))
      CONSTS(12) =  CONSTS(2)/CONSTS(1) ** (1.00000 - CONSTS(8))/CONSTS(11)*CONSTS(6)/CONSTS(5) ** CONSTS(4)/CONSTS(11)
      CONSTS(13) =  CONSTS(2)/CONSTS(1) ** CONSTS(7)/CONSTS(11)*CONSTS(6)/CONSTS(5) ** (1.00000 - CONSTS(3))/CONSTS(11)
      RETURN
      END
      SUBROUTINE computeRates(VOI, CONSTS,  RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      RATES(1) =  CONSTS(1)*STATES(1) ** CONSTS(3)*STATES(2) ** CONSTS(4) -  CONSTS(2)*STATES(1)
      RATES(2) =  CONSTS(5)*STATES(1) ** CONSTS(7)*STATES(2) ** CONSTS(8) -  CONSTS(6)*STATES(2)
      ALGBRC(1) = TERNRY(STATES(1).GT.CONSTS(12), STATES(1) - CONSTS(12), 0.00000)
      ALGBRC(2) = TERNRY(STATES(2).GT.CONSTS(13), STATES(2) - CONSTS(13), 0.00000)
      RATES(3) =  CONSTS(10)*ALGBRC(2) -  CONSTS(9)*ALGBRC(1)
      RETURN
      END
      SUBROUTINE computeVariables(VOI, CONSTS, RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) = TERNRY(STATES(1).GT.CONSTS(12), STATES(1) - CONSTS(12), 0.00000)
      ALGBRC(2) = TERNRY(STATES(2).GT.CONSTS(13), STATES(2) - CONSTS(13), 0.00000)
      RETURN
      END
      REAL FUNCTION TERNRY(TEST, VALA, VALB)
      LOGICAL TEST
      REAL VALA, VALB
      IF (TEST) THEN
        TERNRY = VALA
      ELSE
        TERNRY = VALB
      ENDIF
      RETURN
      END