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#ifdef GSLODE1
////////////////////////////// ODE V1 //////////////////////////////////////////
#include <gsl/gsl_odeiv.h>
typedef struct {int n; int (*f)(double,int, const double*, int, double *); int (*j)(double,int, const double*, int, int, double*);} Tode;
int odefunc (double t, const double y[], double f[], void *params) {
Tode * P = (Tode*) params;
(P->f)(t,P->n,y,P->n,f);
return GSL_SUCCESS;
}
int odejac (double t, const double y[], double *dfdy, double dfdt[], void *params) {
Tode * P = ((Tode*) params);
(P->j)(t,P->n,y,P->n,P->n,dfdy);
int j;
for (j=0; j< P->n; j++)
dfdt[j] = 0.0;
return GSL_SUCCESS;
}
int ode(int method, double h, double eps_abs, double eps_rel,
int f(double, int, const double*, int, double*),
int jac(double, int, const double*, int, int, double*),
KRVEC(xi), KRVEC(ts), RMAT(sol)) {
const gsl_odeiv_step_type * T;
switch(method) {
case 0 : {T = gsl_odeiv_step_rk2; break; }
case 1 : {T = gsl_odeiv_step_rk4; break; }
case 2 : {T = gsl_odeiv_step_rkf45; break; }
case 3 : {T = gsl_odeiv_step_rkck; break; }
case 4 : {T = gsl_odeiv_step_rk8pd; break; }
case 5 : {T = gsl_odeiv_step_rk2imp; break; }
case 6 : {T = gsl_odeiv_step_rk4imp; break; }
case 7 : {T = gsl_odeiv_step_bsimp; break; }
case 8 : { printf("Sorry: ODE rk1imp not available in this GSL version\n"); exit(0); }
case 9 : { printf("Sorry: ODE msadams not available in this GSL version\n"); exit(0); }
case 10: { printf("Sorry: ODE msbdf not available in this GSL version\n"); exit(0); }
default: ERROR(BAD_CODE);
}
gsl_odeiv_step * s = gsl_odeiv_step_alloc (T, xin);
gsl_odeiv_control * c = gsl_odeiv_control_y_new (eps_abs, eps_rel);
gsl_odeiv_evolve * e = gsl_odeiv_evolve_alloc (xin);
Tode P;
P.f = f;
P.j = jac;
P.n = xin;
gsl_odeiv_system sys = {odefunc, odejac, xin, &P};
double t = tsp[0];
double* y = (double*)calloc(xin,sizeof(double));
int i,j;
for(i=0; i< xin; i++) {
y[i] = xip[i];
solp[i] = xip[i];
}
for (i = 1; i < tsn ; i++)
{
double ti = tsp[i];
while (t < ti)
{
gsl_odeiv_evolve_apply (e, c, s,
&sys,
&t, ti, &h,
y);
// if (h < hmin) h = hmin;
}
for(j=0; j<xin; j++) {
solp[i*xin + j] = y[j];
}
}
free(y);
gsl_odeiv_evolve_free (e);
gsl_odeiv_control_free (c);
gsl_odeiv_step_free (s);
return 0;
}
#else
///////////////////// ODE V2 ///////////////////////////////////////////////////
#include <gsl/gsl_odeiv2.h>
typedef struct {int n; int (*f)(double,int, const double*, int, double *); int (*j)(double,int, const double*, int, int, double*);} Tode;
int odefunc (double t, const double y[], double f[], void *params) {
Tode * P = (Tode*) params;
(P->f)(t,P->n,y,P->n,f);
return GSL_SUCCESS;
}
int odejac (double t, const double y[], double *dfdy, double dfdt[], void *params) {
Tode * P = ((Tode*) params);
(P->j)(t,P->n,y,P->n,P->n,dfdy);
int j;
for (j=0; j< P->n; j++)
dfdt[j] = 0.0;
return GSL_SUCCESS;
}
int ode(int method, double h, double eps_abs, double eps_rel,
int f(double, int, const double*, int, double*),
int jac(double, int, const double*, int, int, double*),
KRVEC(xi), KRVEC(ts), RMAT(sol)) {
const gsl_odeiv2_step_type * T;
switch(method) {
case 0 : {T = gsl_odeiv2_step_rk2; break; }
case 1 : {T = gsl_odeiv2_step_rk4; break; }
case 2 : {T = gsl_odeiv2_step_rkf45; break; }
case 3 : {T = gsl_odeiv2_step_rkck; break; }
case 4 : {T = gsl_odeiv2_step_rk8pd; break; }
case 5 : {T = gsl_odeiv2_step_rk2imp; break; }
case 6 : {T = gsl_odeiv2_step_rk4imp; break; }
case 7 : {T = gsl_odeiv2_step_bsimp; break; }
case 8 : {T = gsl_odeiv2_step_rk1imp; break; }
case 9 : {T = gsl_odeiv2_step_msadams; break; }
case 10: {T = gsl_odeiv2_step_msbdf; break; }
default: ERROR(BAD_CODE);
}
Tode P;
P.f = f;
P.j = jac;
P.n = xin;
gsl_odeiv2_system sys = {odefunc, odejac, xin, &P};
gsl_odeiv2_driver * d =
gsl_odeiv2_driver_alloc_y_new (&sys, T, h, eps_abs, eps_rel);
double t = tsp[0];
double* y = (double*)calloc(xin,sizeof(double));
int i,j;
int status=0;
for(i=0; i< xin; i++) {
y[i] = xip[i];
solp[i] = xip[i];
}
for (i = 1; i < tsn ; i++)
{
double ti = tsp[i];
status = gsl_odeiv2_driver_apply (d, &t, ti, y);
if (status != GSL_SUCCESS) {
printf ("error in ode, return value=%d\n", status);
break;
}
// printf ("%.5e %.5e %.5e\n", t, y[0], y[1]);
for(j=0; j<xin; j++) {
solp[i*xin + j] = y[j];
}
}
free(y);
gsl_odeiv2_driver_free (d);
return status;
}
#endif
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