/*
   There are a total of 8 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 13 entries in the constant variable array.
 */
/*
 * VOI is t in component environment (second).
 * CONSTANTS[0] is C_m in component environment (fF).
 * CONSTANTS[1] is w_i in component environment (pL).
 * CONSTANTS[2] is w_o in component environment (pL).
 * STATES[0] is q_mem in component environment (fC).
 * CONSTANTS[3] is R in component environment (J_per_K_per_mol).
 * CONSTANTS[4] is T in component environment (kelvin).
 * CONSTANTS[5] is F in component environment (C_per_mol).
 * ALGEBRAIC[6] is v_KACh in component KACh (fmol_per_sec).
 * STATES[1] is q_K_o in component environment (fmol).
 * STATES[2] is q_K_i in component environment (fmol).
 * CONSTANTS[6] is q_Gibetagamma in component environment (fmol).
 * ALGEBRAIC[0] is V_mem in component environment (J_per_C).
 * ALGEBRAIC[7] is I_mem_KACh in component KACh (fA).
 * CONSTANTS[7] is kappa_KACh in component KACh_parameters (fmol_per_sec).
 * CONSTANTS[8] is K_K_i in component KACh_parameters (per_fmol).
 * CONSTANTS[9] is K_K_o in component KACh_parameters (per_fmol).
 * CONSTANTS[10] is K_Gibetagamma in component KACh_parameters (per_fmol).
 * CONSTANTS[11] is zK in component KACh_parameters (dimensionless).
 * ALGEBRAIC[1] is mu_K_i in component KACh (J_per_mol).
 * ALGEBRAIC[2] is mu_K_o in component KACh (J_per_mol).
 * CONSTANTS[12] is mu_Gibetagamma in component KACh (J_per_mol).
 * ALGEBRAIC[4] is Af_KACh in component KACh (J_per_mol).
 * ALGEBRAIC[5] is Ar_KACh in component KACh (J_per_mol).
 * ALGEBRAIC[3] is Am_KACh in component KACh (J_per_mol).
 * RATES[2] is d/dt q_K_i in component environment (fmol).
 * RATES[1] is d/dt q_K_o in component environment (fmol).
 * RATES[0] is d/dt q_mem in component environment (fC).
 */
void
initConsts(double* CONSTANTS, double* RATES, double *STATES)
{
CONSTANTS[0] = 1e6;
CONSTANTS[1] = 25.8;
CONSTANTS[2] = 3.52;
STATES[0] = -8.5e4;
CONSTANTS[3] = 8.31;
CONSTANTS[4] = 310;
CONSTANTS[5] = 96500;
STATES[1] = 9.3276;
STATES[2] = 0.00456;
CONSTANTS[6] = 1e-6;
CONSTANTS[7] = 0.217237;
CONSTANTS[8] = 0.013549;
CONSTANTS[9] = 0.0899434;
CONSTANTS[10] = 1e-6;
CONSTANTS[11] = 1;
CONSTANTS[12] =  CONSTANTS[3]*CONSTANTS[4]*log( CONSTANTS[10]*CONSTANTS[6]);
}
void
computeRates(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
ALGEBRAIC[0] = STATES[0]/CONSTANTS[0];
ALGEBRAIC[1] =  CONSTANTS[3]*CONSTANTS[4]*log( CONSTANTS[8]*STATES[2]);
ALGEBRAIC[4] = ALGEBRAIC[1]+ CONSTANTS[11]*CONSTANTS[5]*ALGEBRAIC[0]+CONSTANTS[12];
ALGEBRAIC[2] =  CONSTANTS[3]*CONSTANTS[4]*log( CONSTANTS[9]*STATES[1]);
ALGEBRAIC[5] = ALGEBRAIC[2];
ALGEBRAIC[3] =  CONSTANTS[11]*CONSTANTS[5]*ALGEBRAIC[0];
ALGEBRAIC[6] = (ALGEBRAIC[3]==0.00000 ?  CONSTANTS[7]*(exp(ALGEBRAIC[4]/( CONSTANTS[3]*CONSTANTS[4])) - exp(ALGEBRAIC[5]/( CONSTANTS[3]*CONSTANTS[4]))) :  ((( CONSTANTS[7]*ALGEBRAIC[3])/( CONSTANTS[3]*CONSTANTS[4]))/(exp(ALGEBRAIC[3]/( CONSTANTS[3]*CONSTANTS[4])) - 1.00000))*(exp(ALGEBRAIC[4]/( CONSTANTS[3]*CONSTANTS[4])) - exp(ALGEBRAIC[5]/( CONSTANTS[3]*CONSTANTS[4]))));
RATES[2] = - ALGEBRAIC[6];
RATES[1] = ALGEBRAIC[6];
ALGEBRAIC[7] =  - CONSTANTS[11]*CONSTANTS[5]*ALGEBRAIC[6];
RATES[0] = ALGEBRAIC[7];
}
void
computeVariables(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
ALGEBRAIC[0] = STATES[0]/CONSTANTS[0];
ALGEBRAIC[1] =  CONSTANTS[3]*CONSTANTS[4]*log( CONSTANTS[8]*STATES[2]);
ALGEBRAIC[4] = ALGEBRAIC[1]+ CONSTANTS[11]*CONSTANTS[5]*ALGEBRAIC[0]+CONSTANTS[12];
ALGEBRAIC[2] =  CONSTANTS[3]*CONSTANTS[4]*log( CONSTANTS[9]*STATES[1]);
ALGEBRAIC[5] = ALGEBRAIC[2];
ALGEBRAIC[3] =  CONSTANTS[11]*CONSTANTS[5]*ALGEBRAIC[0];
ALGEBRAIC[6] = (ALGEBRAIC[3]==0.00000 ?  CONSTANTS[7]*(exp(ALGEBRAIC[4]/( CONSTANTS[3]*CONSTANTS[4])) - exp(ALGEBRAIC[5]/( CONSTANTS[3]*CONSTANTS[4]))) :  ((( CONSTANTS[7]*ALGEBRAIC[3])/( CONSTANTS[3]*CONSTANTS[4]))/(exp(ALGEBRAIC[3]/( CONSTANTS[3]*CONSTANTS[4])) - 1.00000))*(exp(ALGEBRAIC[4]/( CONSTANTS[3]*CONSTANTS[4])) - exp(ALGEBRAIC[5]/( CONSTANTS[3]*CONSTANTS[4]))));
ALGEBRAIC[7] =  - CONSTANTS[11]*CONSTANTS[5]*ALGEBRAIC[6];
}