/*
   There are a total of 3 entries in the algebraic variable array.
   There are a total of 3 entries in each of the rate and state variable arrays.
   There are a total of 11 entries in the constant variable array.
 */
/*
 * VOI is time in component environment (hour).
 * STATES[0] is PRL in component PRL (nanog_ml).
 * CONSTANTS[0] is kD in component PRL (nanog_ml).
 * CONSTANTS[1] is kO in component PRL (picog_ml).
 * CONSTANTS[2] is rP in component PRL (nanog_ml_hr).
 * CONSTANTS[3] is qP in component PRL (first_order_rate_constant).
 * STATES[1] is OT in component OT (picog_ml).
 * STATES[2] is DA in component DA (nanog_ml).
 * ALGEBRAIC[0] is vD in component DA (nanog_ml_hr).
 * CONSTANTS[4] is vDbar in component DA (nanog_ml_hr).
 * CONSTANTS[5] is DA_infinity in component DA (nanog_ml).
 * CONSTANTS[6] is qD in component DA (first_order_rate_constant).
 * CONSTANTS[7] is kx in component OT (picog_ml).
 * ALGEBRAIC[1] is vO in component OT (picog_ml_hr).
 * CONSTANTS[8] is vObar in component OT (picog_ml_hr).
 * CONSTANTS[9] is rO in component OT (picog_ml_hr).
 * CONSTANTS[10] is qO in component OT (first_order_rate_constant).
 * ALGEBRAIC[2] is x in component x (picog_ml).
 * RATES[0] is d/dt PRL in component PRL (nanog_ml).
 * RATES[2] is d/dt DA in component DA (nanog_ml).
 * RATES[1] is d/dt OT in component OT (picog_ml).
 */
void
initConsts(double* CONSTANTS, double* RATES, double *STATES)
{
STATES[0] = 20.0;
CONSTANTS[0] = 300.0;
CONSTANTS[1] = 9.0;
CONSTANTS[2] = 300000.0;
CONSTANTS[3] = 0.5;
STATES[1] = 25.0;
STATES[2] = 20000.0;
CONSTANTS[4] = 10000.0;
CONSTANTS[5] = 20000.0;
CONSTANTS[6] = 0.2;
CONSTANTS[7] = 50.0;
CONSTANTS[8] = 500.0;
CONSTANTS[9] = 1100.0;
CONSTANTS[10] = 1.0;
}
void
computeRates(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
RATES[0] =  CONSTANTS[2]*(1.00000/(CONSTANTS[0]+STATES[2]))*pow(STATES[1]/(CONSTANTS[1]+STATES[1]), 2.00000) -  CONSTANTS[3]*STATES[0];
ALGEBRAIC[0] = (VOI>=2.00000&&VOI<=4.00000 ? CONSTANTS[4] : 0.00000);
RATES[2] =  CONSTANTS[6]*(CONSTANTS[5] - STATES[2]) - ALGEBRAIC[0];
ALGEBRAIC[1] = (VOI>=2.00000&&VOI<=4.00000 ? CONSTANTS[8] : 0.00000);
ALGEBRAIC[2] = (VOI>=2.00000&&VOI<=4.00000 ? 51.0000 : VOI>=16.0000&&VOI<=18.0000 ? 51.0000 : 1.00000);
RATES[1] =  CONSTANTS[9]*(ALGEBRAIC[2]/(CONSTANTS[7]+ALGEBRAIC[2])) - ( CONSTANTS[10]*STATES[1]+ALGEBRAIC[1]);
}
void
computeVariables(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
ALGEBRAIC[0] = (VOI>=2.00000&&VOI<=4.00000 ? CONSTANTS[4] : 0.00000);
ALGEBRAIC[1] = (VOI>=2.00000&&VOI<=4.00000 ? CONSTANTS[8] : 0.00000);
ALGEBRAIC[2] = (VOI>=2.00000&&VOI<=4.00000 ? 51.0000 : VOI>=16.0000&&VOI<=18.0000 ? 51.0000 : 1.00000);
}