C
C There are a total of 11 entries in the algebraic variable array.
C There are a total of 2 entries in each of the rate and state variable arrays.
C There are a total of 11 entries in the constant variable array.
C
C
C VOI is time in component environment (minute).
C CONSTS(1) is VPF in component pulmonary_O2_uptake (litre).
C CONSTS(2) is DOB in component pulmonary_O2_uptake (mL_per_minute).
C CONSTS(3) is QRO in component pulmonary_O2_uptake (L_per_minute).
C CONSTS(4) is RMO in component pulmonary_O2_uptake (mL_per_minute).
C CONSTS(5) is HM in component pulmonary_O2_uptake (dimensionless).
C CONSTS(10) is O2UTIL in component total_O2_utilization (mL_per_minute).
C ALGBRC(6) is O2VAD2 in component progressive_chemoreceptor_adaptation_of_alveolar_ventilation (dimensionless).
C ALGBRC(5) is O2VTS2 in component acute_chemoreceptor_adaptation_of_alveolar_ventilation (dimensionless).
C ALGBRC(8) is ALVENT in component alveolar_ventilation (L_per_minute).
C CONSTS(6) is VNTSTM in component parameter_values (dimensionless).
C ALGBRC(9) is PO2ALV in component alveolar_PO2 (mmHg).
C CONSTS(7) is PO2AMB in component parameter_values (mmHg).
C ALGBRC(2) is PO2ART in component arterial_PO2 (mmHg).
C ALGBRC(10) is O2DFS in component respiratory_O2_diffusion_into_capillaries (mL_per_minute).
C CONSTS(8) is PL2 in component parameter_values (L_mL_per_minute_per_mmHg).
C CONSTS(9) is VPTISS in component parameter_values (litre).
C CONSTS(11) is RSPDFC in component respiratory_O2_diffusion_into_capillaries (mL_per_minute_per_mmHg).
C STATES(1) is OVA in component O2_volume_of_arterial_blood (mL_per_L).
C ALGBRC(11) is DOVA in component O2_volume_of_arterial_blood (mL_per_L_per_minute).
C ALGBRC(1) is OSA in component arterial_PO2 (dimensionless).
C ALGBRC(4) is O2VTST in component acute_chemoreceptor_adaptation_of_alveolar_ventilation (dimensionless).
C ALGBRC(3) is O2VTST1 in component acute_chemoreceptor_adaptation_of_alveolar_ventilation (dimensionless).
C ALGBRC(7) is DO2VAD in component progressive_chemoreceptor_adaptation_of_alveolar_ventilation (per_minute).
C STATES(2) is O2VAD1 in component progressive_chemoreceptor_adaptation_of_alveolar_ventilation (dimensionless).
C RATES(1) is d/dt OVA in component O2_volume_of_arterial_blood (mL_per_L).
C RATES(2) is d/dt O2VAD1 in component progressive_chemoreceptor_adaptation_of_alveolar_ventilation (dimensionless).
C
      SUBROUTINE initConsts(CONSTS, RATES, STATES)
      REAL CONSTS(*), RATES(*), STATES(*)
      CONSTS(1) = 0.0123238
      CONSTS(2) = 163.508
      CONSTS(3) = 4.97838
      CONSTS(4) = 56.8057
      CONSTS(5) = 40.0381
      CONSTS(6) = 1
      CONSTS(7) = 150
      CONSTS(8) = 1.8
      CONSTS(9) = 0.0175
      STATES(1) = 204.497
      STATES(2) = 2.368e-07
      CONSTS(10) = CONSTS(2)+CONSTS(4)
      CONSTS(11) = CONSTS(8)/(CONSTS(9)+CONSTS(1))
      RETURN
      END
      SUBROUTINE computeRates(VOI, CONSTS,  RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) = (STATES(1)/CONSTS(5))/5.25000
      ALGBRC(2) = TERNRY(ALGBRC(1).GT.1.00000, 114.000+ (ALGBRC(1) - 1.00000)*6667.00, TERNRY(ALGBRC(1).GT.0.936000.AND.ALGBRC(1).LE.1.00000, 74.0000+ (ALGBRC(1) - 0.936000)*625.000, TERNRY(ALGBRC(1).GT.0.800000.AND.ALGBRC(1).LE.0.936000, 46.0000+ (ALGBRC(1) - 0.800000)*205.882,  ALGBRC(1)*57.5000)
      ALGBRC(3) = (ALGBRC(2) - 67.0000)/30.0000
      ALGBRC(4) = TERNRY(ALGBRC(3).GT.1.00000, 1.00000, TERNRY(ALGBRC(3).LT.0.600000, 0.600000, ALGBRC(3))
      ALGBRC(5) = 1.00000/ALGBRC(4)
      ALGBRC(7) =  ( (ALGBRC(5) - 1.00000)*3.00000 - STATES(2))*0.000500000
      RATES(2) = ALGBRC(7)
      ALGBRC(6) = STATES(2)+1.00000
      ALGBRC(8) =  CONSTS(10)*CONSTS(6)*0.0266670*ALGBRC(5)*ALGBRC(6)
      ALGBRC(9) = CONSTS(7) - (CONSTS(10)/ALGBRC(8))/0.761000
      ALGBRC(10) =  (ALGBRC(9) - ALGBRC(2))*CONSTS(11)
      ALGBRC(11) = (ALGBRC(10) - CONSTS(10))/( CONSTS(3)*1.00000)
      RATES(1) = ALGBRC(11)
      RETURN
      END
      SUBROUTINE computeVariables(VOI, CONSTS, RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) = (STATES(1)/CONSTS(5))/5.25000
      ALGBRC(2) = TERNRY(ALGBRC(1).GT.1.00000, 114.000+ (ALGBRC(1) - 1.00000)*6667.00, TERNRY(ALGBRC(1).GT.0.936000.AND.ALGBRC(1).LE.1.00000, 74.0000+ (ALGBRC(1) - 0.936000)*625.000, TERNRY(ALGBRC(1).GT.0.800000.AND.ALGBRC(1).LE.0.936000, 46.0000+ (ALGBRC(1) - 0.800000)*205.882,  ALGBRC(1)*57.5000)
      ALGBRC(3) = (ALGBRC(2) - 67.0000)/30.0000
      ALGBRC(4) = TERNRY(ALGBRC(3).GT.1.00000, 1.00000, TERNRY(ALGBRC(3).LT.0.600000, 0.600000, ALGBRC(3))
      ALGBRC(5) = 1.00000/ALGBRC(4)
      ALGBRC(7) =  ( (ALGBRC(5) - 1.00000)*3.00000 - STATES(2))*0.000500000
      ALGBRC(6) = STATES(2)+1.00000
      ALGBRC(8) =  CONSTS(10)*CONSTS(6)*0.0266670*ALGBRC(5)*ALGBRC(6)
      ALGBRC(9) = CONSTS(7) - (CONSTS(10)/ALGBRC(8))/0.761000
      ALGBRC(10) =  (ALGBRC(9) - ALGBRC(2))*CONSTS(11)
      ALGBRC(11) = (ALGBRC(10) - CONSTS(10))/( CONSTS(3)*1.00000)
      RETURN
      END
      REAL FUNCTION TERNRY(TEST, VALA, VALB)
      LOGICAL TEST
      REAL VALA, VALB
      IF (TEST) THEN
        TERNRY = VALA
      ELSE
        TERNRY = VALB
      ENDIF
      RETURN
      END