/*
   There are a total of 3 entries in the algebraic variable array.
   There are a total of 4 entries in each of the rate and state variable arrays.
   There are a total of 9 entries in the constant variable array.
 */
/*
 * VOI is time in component environment (day).
 * STATES[0] is x in component x (per_mm3).
 * CONSTANTS[0] is lamda in component x (per_mm3_per_day).
 * CONSTANTS[1] is d in component x (per_day).
 * CONSTANTS[2] is beta in component kinetic_parameters (mm3_per_day).
 * ALGEBRAIC[0] is s in component kinetic_parameters (dimensionless).
 * STATES[1] is y in component y (per_mm3).
 * CONSTANTS[3] is a in component y (per_day).
 * CONSTANTS[4] is p in component kinetic_parameters (mm3_per_day).
 * STATES[2] is z in component z (per_mm3).
 * ALGEBRAIC[1] is log_y in component y (dimensionless).
 * STATES[3] is w in component w (per_mm3).
 * CONSTANTS[5] is b in component w (per_day).
 * CONSTANTS[6] is c in component kinetic_parameters (mm3_mm3_per_day).
 * CONSTANTS[7] is q in component kinetic_parameters (per_mm3).
 * ALGEBRAIC[2] is log_w in component w (dimensionless).
 * CONSTANTS[8] is h in component z (per_day).
 * RATES[0] is d/dt x in component x (per_mm3).
 * RATES[1] is d/dt y in component y (per_mm3).
 * RATES[3] is d/dt w in component w (per_mm3).
 * RATES[2] is d/dt z in component z (per_mm3).
 */
void
initConsts(double* CONSTANTS, double* RATES, double *STATES)
{
STATES[0] = 10;
CONSTANTS[0] = 1;
CONSTANTS[1] = 0.1;
CONSTANTS[2] = 0.5;
STATES[1] = 0.1;
CONSTANTS[3] = 0.2;
CONSTANTS[4] = 1;
STATES[2] = 0;
STATES[3] = 0.001;
CONSTANTS[5] = 0.01;
CONSTANTS[6] = 0.1;
CONSTANTS[7] = 0.5;
CONSTANTS[8] = 0.1;
}
void
computeRates(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
RATES[3] =  CONSTANTS[6]*STATES[0]*STATES[1]*STATES[3] - ( CONSTANTS[6]*CONSTANTS[7]*STATES[1]*STATES[3]+ CONSTANTS[5]*STATES[3]);
RATES[2] =  CONSTANTS[6]*CONSTANTS[7]*STATES[1]*STATES[3] -  CONSTANTS[8]*STATES[2];
ALGEBRAIC[0] = (VOI<=15.0000 ? 1.00000 : VOI>=40.0000 ? 1.00000 : 0.00420000);
RATES[0] = CONSTANTS[0] - ( CONSTANTS[1]*STATES[0]+ ALGEBRAIC[0]*CONSTANTS[2]*STATES[0]*STATES[1]);
RATES[1] =  ALGEBRAIC[0]*CONSTANTS[2]*STATES[0]*STATES[1] - ( CONSTANTS[3]*STATES[1]+ CONSTANTS[4]*STATES[1]*STATES[2]);
}
void
computeVariables(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
ALGEBRAIC[0] = (VOI<=15.0000 ? 1.00000 : VOI>=40.0000 ? 1.00000 : 0.00420000);
ALGEBRAIC[1] = arbitrary_log( STATES[1]*1.00000, 10);
ALGEBRAIC[2] = arbitrary_log( STATES[3]*1.00000, 10);
}