mrkiss_erk_ralston_2 Module Reference

Butcher tableau for ralston's 2 stage order (4) Runge-Kutta method. More...

Variables
integer, parameter	s = 2
	The order of the overall method.
integer, parameter	m = 1
	Number of methods.
real(kind=rk), dimension(s, s), parameter	a
	The \(\mathbf{a}\) matrix for the Butcher Tableau.
real(kind=rk), dimension(s, m), parameter	b
	The \(\mathbf{b}\) matrix for the Butcher Tableau.
real(kind=rk), dimension(s), parameter	c
	The \(\mathbf{c}\) matrix for the Butcher Tableau.
integer, dimension(m), parameter	p = [2]
	The method orders.
integer, dimension(m), parameter	se = [2]
	Number of stages for each method.

Detailed Description

Butcher tableau for ralston's 2 stage order (4) Runge-Kutta method.

IMO

This method was designed to minimize truncation error over every other consideration includeing stability, roundoff error, performance, and storage.

Stability Image Links

References:

• Ralston (1962); Runge-Kutta Methods with Minimum Error Bounds; Math. of Comp. 16 (80); p431-437; zotero://select/items/0_2FK7F4J3

Variable Documentation

s

integer, parameter mrkiss_erk_ralston_2::s = 2

The order of the overall method.

Definition at line 60 of file mrkiss_erk_ralston_2.f90.

m

integer, parameter mrkiss_erk_ralston_2::m = 1

Number of methods.

Definition at line 62 of file mrkiss_erk_ralston_2.f90.

a

real(kind=rk), dimension(s,s), parameter mrkiss_erk_ralston_2::a

The \(\mathbf{a}\) matrix for the Butcher Tableau.

Definition at line 64 of file mrkiss_erk_ralston_2.f90.

  real(kind=rk),    parameter :: a(s,s) = reshape([0.0_rk, 0.0_rk, &
                                                   2.0_rk, 0.0_rk], [s, s]) / 3.0_rk

b

real(kind=rk), dimension(s,m), parameter mrkiss_erk_ralston_2::b

The \(\mathbf{b}\) matrix for the Butcher Tableau.

Definition at line 67 of file mrkiss_erk_ralston_2.f90.

  real(kind=rk),    parameter :: b(s,m) = reshape([1.0_rk, 3.0_rk], [s, m]) / 4.0_rk

c

real(kind=rk), dimension(s), parameter mrkiss_erk_ralston_2::c

The \(\mathbf{c}\) matrix for the Butcher Tableau.

Definition at line 69 of file mrkiss_erk_ralston_2.f90.

  real(kind=rk),    parameter :: c(s)   = [        0.0_rk, 2.0_rk]          / 3.0_rk

p

integer, dimension(m), parameter mrkiss_erk_ralston_2::p = [2]

The method orders.

Definition at line 71 of file mrkiss_erk_ralston_2.f90.

se

integer, dimension(m), parameter mrkiss_erk_ralston_2::se = [2]

Number of stages for each method.

Definition at line 73 of file mrkiss_erk_ralston_2.f90.