C
C There are a total of 8 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 t in component environment (second).
C CONSTS(1) is C_m in component environment (fF).
C CONSTS(2) is w_i in component environment (pL).
C CONSTS(3) is w_o in component environment (pL).
C STATES(1) is q_mem in component environment (fC).
C CONSTS(4) is R in component environment (J_per_K_per_mol).
C CONSTS(5) is T in component environment (kelvin).
C CONSTS(6) is F in component environment (C_per_mol).
C ALGBRC(7) is v_KACh in component KACh (fmol_per_sec).
C STATES(2) is q_K_o in component environment (fmol).
C STATES(3) is q_K_i in component environment (fmol).
C CONSTS(7) is q_Gibetagamma in component environment (fmol).
C ALGBRC(1) is V_mem in component environment (J_per_C).
C ALGBRC(8) is I_mem_KACh in component KACh (fA).
C CONSTS(8) is kappa_KACh in component KACh_parameters (fmol_per_sec).
C CONSTS(9) is K_K_i in component KACh_parameters (per_fmol).
C CONSTS(10) is K_K_o in component KACh_parameters (per_fmol).
C CONSTS(11) is K_Gibetagamma in component KACh_parameters (per_fmol).
C CONSTS(12) is zK in component KACh_parameters (dimensionless).
C ALGBRC(2) is mu_K_i in component KACh (J_per_mol).
C ALGBRC(3) is mu_K_o in component KACh (J_per_mol).
C CONSTS(13) is mu_Gibetagamma in component KACh (J_per_mol).
C ALGBRC(5) is Af_KACh in component KACh (J_per_mol).
C ALGBRC(6) is Ar_KACh in component KACh (J_per_mol).
C ALGBRC(4) is Am_KACh in component KACh (J_per_mol).
C RATES(3) is d/dt q_K_i in component environment (fmol).
C RATES(2) is d/dt q_K_o in component environment (fmol).
C RATES(1) is d/dt q_mem in component environment (fC).
C
      SUBROUTINE initConsts(CONSTS, RATES, STATES)
      REAL CONSTS(*), RATES(*), STATES(*)
      CONSTS(1) = 1e6
      CONSTS(2) = 25.8
      CONSTS(3) = 3.52
      STATES(1) = -8.5e4
      CONSTS(4) = 8.31
      CONSTS(5) = 310
      CONSTS(6) = 96500
      STATES(2) = 9.3276
      STATES(3) = 0.00456
      CONSTS(7) = 1e-6
      CONSTS(8) = 0.217237
      CONSTS(9) = 0.013549
      CONSTS(10) = 0.0899434
      CONSTS(11) = 1e-6
      CONSTS(12) = 1
      CONSTS(13) =  CONSTS(4)*CONSTS(5)*log( CONSTS(11)*CONSTS(7))
      RETURN
      END
      SUBROUTINE computeRates(VOI, CONSTS,  RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) = STATES(1)/CONSTS(1)
      ALGBRC(2) =  CONSTS(4)*CONSTS(5)*log( CONSTS(9)*STATES(3))
      ALGBRC(5) = ALGBRC(2)+ CONSTS(12)*CONSTS(6)*ALGBRC(1)+CONSTS(13)
      ALGBRC(3) =  CONSTS(4)*CONSTS(5)*log( CONSTS(10)*STATES(2))
      ALGBRC(6) = ALGBRC(3)
      ALGBRC(4) =  CONSTS(12)*CONSTS(6)*ALGBRC(1)
      ALGBRC(7) = TERNRY(ALGBRC(4).EQ.0.00000,  CONSTS(8)*(EXP(ALGBRC(5)/( CONSTS(4)*CONSTS(5))) - EXP(ALGBRC(6)/( CONSTS(4)*CONSTS(5)))),  ((( CONSTS(8)*ALGBRC(4))/( CONSTS(4)*CONSTS(5)))/(EXP(ALGBRC(4)/( CONSTS(4)*CONSTS(5))) - 1.00000))*(EXP(ALGBRC(5)/( CONSTS(4)*CONSTS(5))) - EXP(ALGBRC(6)/( CONSTS(4)*CONSTS(5)))))
      RATES(3) = - ALGBRC(7)
      RATES(2) = ALGBRC(7)
      ALGBRC(8) =  - CONSTS(12)*CONSTS(6)*ALGBRC(7)
      RATES(1) = ALGBRC(8)
      RETURN
      END
      SUBROUTINE computeVariables(VOI, CONSTS, RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) = STATES(1)/CONSTS(1)
      ALGBRC(2) =  CONSTS(4)*CONSTS(5)*log( CONSTS(9)*STATES(3))
      ALGBRC(5) = ALGBRC(2)+ CONSTS(12)*CONSTS(6)*ALGBRC(1)+CONSTS(13)
      ALGBRC(3) =  CONSTS(4)*CONSTS(5)*log( CONSTS(10)*STATES(2))
      ALGBRC(6) = ALGBRC(3)
      ALGBRC(4) =  CONSTS(12)*CONSTS(6)*ALGBRC(1)
      ALGBRC(7) = TERNRY(ALGBRC(4).EQ.0.00000,  CONSTS(8)*(EXP(ALGBRC(5)/( CONSTS(4)*CONSTS(5))) - EXP(ALGBRC(6)/( CONSTS(4)*CONSTS(5)))),  ((( CONSTS(8)*ALGBRC(4))/( CONSTS(4)*CONSTS(5)))/(EXP(ALGBRC(4)/( CONSTS(4)*CONSTS(5))) - 1.00000))*(EXP(ALGBRC(5)/( CONSTS(4)*CONSTS(5))) - EXP(ALGBRC(6)/( CONSTS(4)*CONSTS(5)))))
      ALGBRC(8) =  - CONSTS(12)*CONSTS(6)*ALGBRC(7)
      RETURN
      END
      REAL FUNCTION TERNRY(TEST, VALA, VALB)
      LOGICAL TEST
      REAL VALA, VALB
      IF (TEST) THEN
        TERNRY = VALA
      ELSE
        TERNRY = VALB
      ENDIF
      RETURN
      END