#include <nonadapt_step.h>
This class simply calls the specified ODE stepper without any attempt to modify the size of the step, and is primarily useful to allow for simple comparisons between adaptive and non-adaptive solution. To modify the ODE stepper which is used, use the adapt_step::set_step().
Definition at line 49 of file nonadapt_step.h.
Public Member Functions | |
virtual int | astep (double &x, double &h, double xmax, size_t n, vec_t &y, vec_t &u_dydx_out, vec_t &yerr, param_t &pa, func_t &derivs) |
Make an adaptive integration step of the system derivs . | |
virtual int | astep_derivs (double &x, double &h, double xmax, size_t n, vec_t &y, vec_t &dydx, vec_t &yerr, param_t &pa, func_t &derivs) |
Make an adaptive integration step of the system derivs with derivatives. | |
Protected Attributes | |
size_t | msize |
The allocated vector size. | |
alloc_vec_t | dydx_int |
Internal storage for dydx. | |
alloc_t | ao |
Memory allocator for objects of type alloc_vec_t . |
virtual int astep | ( | double & | x, | |
double & | h, | |||
double | xmax, | |||
size_t | n, | |||
vec_t & | y, | |||
vec_t & | u_dydx_out, | |||
vec_t & | yerr, | |||
param_t & | pa, | |||
func_t & | derivs | |||
) | [inline, virtual] |
Make an adaptive integration step of the system derivs
.
This attempts to take a step of size h
from the point x
of an n-dimensional
system derivs
starting with y
. On exit, x
and y
contain the new values at the end of the step, h
contains the size of the step, dydx_out
contains the derivative at the end of the step, and yerr
contains the estimated error at the end of the step.
If the base stepper returns a non-zero value, that value is passed on as the return value of astep()
, though the input y
may still have been modified by the base stepper.
Implements adapt_step.
Definition at line 103 of file nonadapt_step.h.
virtual int astep_derivs | ( | double & | x, | |
double & | h, | |||
double | xmax, | |||
size_t | n, | |||
vec_t & | y, | |||
vec_t & | dydx, | |||
vec_t & | yerr, | |||
param_t & | pa, | |||
func_t & | derivs | |||
) | [inline, virtual] |
Make an adaptive integration step of the system derivs
with derivatives.
This attempts to take a step of size h
from the point x
of an n-dimensional
system derivs
starting with y
and given the initial derivatives dydx
. On exit, x
, y
and dydx
contain the new values at the end of the step, h
contains the size of the step, dydx
contains the derivative at the end of the step, and yerr
contains the estimated error at the end of the step.
If the base stepper returns a non-zero value, that value is passed on as the return value of astep()
, though the inputs y
and dydx
may still have been modified by the base stepper.
Implements adapt_step.
Definition at line 138 of file nonadapt_step.h.
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