rkf89 Module Procedure

module procedure rkf89 module subroutine rkf89(me, t, x, h, xf, xerr)

Fehlberg 8(9) method.

Reference

E. Fehlberg, "Classical Fifth-, Sixth-, Seventh-, and Eighth-Order Runge-Kutta Formulas with Stepsize Control", NASA TR R-2870.

Arguments

Type	Intent	Optional	Attributes		Name
class(rkf89_class),	intent(inout)			::	me
real(kind=wp),	intent(in)			::	t	initial time
real(kind=wp),	intent(in),		dimension(me%n)	::	x	initial state
real(kind=wp),	intent(in)			::	h	time step
real(kind=wp),	intent(out),		dimension(me%n)	::	xf	state at time `t+h`
real(kind=wp),	intent(out),		dimension(me%n)	::	xerr	truncation error estimate for `x`

Calls

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