rk4 Function

public function rk4(f, x0, y0, h, odefun_param) result(yout)

single step of RK4

Arguments

Type	Intent	Optional	Attributes		Name
procedure(odefun)				::	f
real(kind=real64)				::	x0
real(kind=real64)				::	y0(:)
real(kind=real64)				::	h
real(kind=real64)				::	odefun_param

Return Value real(kind=real64), allocatable, (:)