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Object-oriented Scientific Computing Library: Version 0.910
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Runge-Kutta-Fehlberg embedded Runge-Kutta ODE stepper (GSL) More...
#include <gsl_rkf45.h>
Based on Hairer00 .
Definition at line 60 of file gsl_rkf45.h.
Public Member Functions | |
virtual int | step (double x, double h, size_t n, vec_t &y, vec_t &dydx, vec_t &yout, vec_t &yerr, vec_t &dydx_out, func_t &derivs) |
Perform an integration step. | |
Protected Attributes | |
size_t | ndim |
Size of allocated vectors. | |
alloc_t | ao |
Memory allocator for objects of type alloc_vec_t . | |
Storage for the intermediate steps | |
alloc_vec_t | k2 |
alloc_vec_t | k3 |
alloc_vec_t | k4 |
alloc_vec_t | k5 |
alloc_vec_t | k6 |
alloc_vec_t | ytmp |
Storage for the coefficients | |
double | ah [5] |
double | b3 [2] |
double | b4 [3] |
double | b5 [4] |
double | b6 [5] |
double | c1 |
double | c3 |
double | c4 |
double | c5 |
double | c6 |
double | ec [7] |
virtual int gsl_rkf45< func_t, vec_t, alloc_vec_t, alloc_t >::step | ( | double | x, |
double | h, | ||
size_t | n, | ||
vec_t & | y, | ||
vec_t & | dydx, | ||
vec_t & | yout, | ||
vec_t & | yerr, | ||
vec_t & | dydx_out, | ||
func_t & | derivs | ||
) | [inline, virtual] |
Given initial value of the n-dimensional function in y
and the derivative in dydx
(which must be computed beforehand) at the point x
, take a step of size h
giving the result in yout
, the uncertainty in yerr
, and the new derivative in dydx_out
using function derivs
to calculate derivatives. The parameters yout
and y
and the parameters dydx_out
and dydx
may refer to the same object.
If derivs
always returns zero, then this function will also return zero. If not, step()
will return the first non-zero value which was obtained in a call to derivs
. The error handler is never called.
Implements ode_step< func_t, vec_t >.
Definition at line 156 of file gsl_rkf45.h.
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