/*
   There are a total of 2 entries in the algebraic variable array.
   There are a total of 2 entries in each of the rate and state variable arrays.
   There are a total of 4 entries in the constant variable array.
 */
/*
 * STATES[0] is A in component equation_1 (conc).
 * STATES[1] is D in component equation_1 (conc).
 * ALGEBRAIC[0] is kf in component equation_1 (per_sec).
 * CONSTANTS[0] is kb in component equation_1 (per_sec).
 * VOI is time in component equation_1 (second).
 * CONSTANTS[1] is kf_ in component equation_1 (per_conc_per_sec).
 * CONSTANTS[2] is Tk in component equation_1 (kelvin).
 * CONSTANTS[3] is T in component equation_1 (kelvin).
 * ALGEBRAIC[1] is V in component equation_1 (conc).
 * RATES[0] is d/dt A in component equation_1 (conc).
 * RATES[1] is d/dt D in component equation_1 (conc).
 * There are a total of 0 condition variables.
 */
void
initConsts(double* CONSTANTS, double* RATES, double *STATES)
{
STATES[0] = 0.99;
STATES[1] = 0;
CONSTANTS[0] = 0.00777;
CONSTANTS[1] = 0.00333;
CONSTANTS[2] = 313;
CONSTANTS[3] = 340;
RATES[0] = 0.1001;
RATES[1] = 0.1001;
}
void
computeResiduals(double VOI, double* CONSTANTS, double* RATES, double* OLDRATES, double* STATES,
                 double* OLDSTATES, double* ALGEBRAIC, double* CONDVARS)
{
resid[0] = RATES[0] -  - ALGEBRAIC[0]*STATES[0]+ CONSTANTS[0]*((1.00000 - STATES[0]) - STATES[1]);
resid[1] = RATES[1] -  ALGEBRAIC[0]*((1.00000 - STATES[0]) - STATES[1]);
}
void
computeVariables(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
ALGEBRAIC[1] = (1.00000 - STATES[0]) - STATES[1];
}
void
computeEssentialVariables(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
ALGEBRAIC[0] =  CONSTANTS[1]*exp(CONSTANTS[3]/CONSTANTS[2])*(1.00000 - STATES[0]);
}
void
getStateInformation(double* SI)
{
SI[0] = 1.0;
SI[1] = 1.0;
}
void
computeRoots(double VOI, double* CONSTANTS, double* RATES, double* OLDRATES, double* STATES,
             double* OLDSTATES, double* ALGEBRAIC, double* CONDVARS)
{
}