C
C There are a total of 5 entries in the algebraic variable array.
C There are a total of 1 entries in each of the rate and state variable arrays.
C There are a total of 5 entries in the constant variable array.
C
C
C ALGBRC(1) is V in component environment (millivolt).
C VOI is t in component environment (millisec).
C STATES(1) is n in component potassium_channel_n_gate (dimensionless).
C ALGBRC(4) is i_K in component potassium_channel (microA_per_cm2).
C CONSTS(1) is g_K in component potassium_channel (milliS_per_cm2).
C CONSTS(2) is Ki in component potassium_channel (mM).
C CONSTS(3) is Ko in component potassium_channel (mM).
C CONSTS(4) is RTF in component potassium_channel (millivolt).
C CONSTS(5) is E_K in component potassium_channel (millivolt).
C ALGBRC(2) is K_conductance in component potassium_channel (milliS_per_cm2).
C ALGBRC(3) is alpha_n in component potassium_channel_n_gate (per_millisec).
C ALGBRC(5) is beta_n in component potassium_channel_n_gate (per_millisec).
C RATES(1) is d/dt n in component potassium_channel_n_gate (dimensionless).
C
      SUBROUTINE initConsts(CONSTS, RATES, STATES)
      REAL CONSTS(*), RATES(*), STATES(*)
      STATES(1) = 0.325
      CONSTS(1) = 36
      CONSTS(2) = 90
      CONSTS(3) = 3
      CONSTS(4) = 25
      CONSTS(5) =  CONSTS(4)*log(CONSTS(3)/CONSTS(2))
      RETURN
      END
      SUBROUTINE computeRates(VOI, CONSTS,  RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) = TERNRY(VOI.GT.5.00000.AND.VOI.LT.15.0000, - 85.0000, 0.00000)
      ALGBRC(3) = ( 0.0100000*(ALGBRC(1)+10.0000))/(EXP((ALGBRC(1)+10.0000)/10.0000) - 1.00000)
      ALGBRC(5) =  0.125000*EXP(ALGBRC(1)/80.0000)
      RATES(1) =  ALGBRC(3)*(1.00000 - STATES(1)) -  ALGBRC(5)*STATES(1)
      RETURN
      END
      SUBROUTINE computeVariables(VOI, CONSTS, RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) = TERNRY(VOI.GT.5.00000.AND.VOI.LT.15.0000, - 85.0000, 0.00000)
      ALGBRC(3) = ( 0.0100000*(ALGBRC(1)+10.0000))/(EXP((ALGBRC(1)+10.0000)/10.0000) - 1.00000)
      ALGBRC(5) =  0.125000*EXP(ALGBRC(1)/80.0000)
      ALGBRC(2) =  CONSTS(1)*STATES(1) ** 4.00000
      ALGBRC(4) =  ALGBRC(2)*(ALGBRC(1) - CONSTS(5))
      RETURN
      END
      REAL FUNCTION TERNRY(TEST, VALA, VALB)
      LOGICAL TEST
      REAL VALA, VALB
      IF (TEST) THEN
        TERNRY = VALA
      ELSE
        TERNRY = VALB
      ENDIF
      RETURN
      END