Initial-Value Problems for ODEs. Introduction to Linear Multistep Methods
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1 Initial-Value Problems for ODEs Introduction to Linear Multistep Methods Numerical Analysis (9th Edition) R L Burden & J D Faires Beamer Presentation Slides prepared by John Carroll Dublin City University c 2011 Brooks/Cole, Cengage Learning
2 Outline 1 From One-Step to Multistep Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 2 / 17
3 Outline 1 From One-Step to Multistep Methods 2 m-step Multistep Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 2 / 17
4 Outline 1 From One-Step to Multistep Methods 2 m-step Multistep Methods 3 Example 4-Step Multistep Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 2 / 17
5 Outline 1 From One-Step to Multistep Methods 2 m-step Multistep Methods 3 Example 4-Step Multistep Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 3 / 17
6 From One-Step to Multistep Methods The Nature of One-Step Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 4 / 17
7 From One-Step to Multistep Methods The Nature of One-Step Methods The methods met so far are called one-step methods because the approximation for the mesh point t i+1 involves information from only one of the previous mesh points, t i. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 4 / 17
8 From One-Step to Multistep Methods The Nature of One-Step Methods The methods met so far are called one-step methods because the approximation for the mesh point t i+1 involves information from only one of the previous mesh points, t i. Although these methods might use function evaluation information at points between t i and t i+1, they do not retain that information for direct use in future approximations. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 4 / 17
9 From One-Step to Multistep Methods The Nature of One-Step Methods The methods met so far are called one-step methods because the approximation for the mesh point t i+1 involves information from only one of the previous mesh points, t i. Although these methods might use function evaluation information at points between t i and t i+1, they do not retain that information for direct use in future approximations. All the information used by these methods is obtained within the subinterval over which the solution is being approximated. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 4 / 17
10 From One-Step to Multistep Methods Moving to Multistep Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 5 / 17
11 From One-Step to Multistep Methods Moving to Multistep Methods The approximate solution is available at each of the mesh points t 0, t 1,...,t i before the approximation at t i+1 is obtained, and because the error w j y(t j ) tends to increase with j,... Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 5 / 17
12 From One-Step to Multistep Methods Moving to Multistep Methods The approximate solution is available at each of the mesh points t 0, t 1,...,t i before the approximation at t i+1 is obtained, and because the error w j y(t j ) tends to increase with j,... so it seems reasonable to develop methods that use these more accurate previous data when approximating the solution at t i+1. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 5 / 17
13 From One-Step to Multistep Methods Moving to Multistep Methods The approximate solution is available at each of the mesh points t 0, t 1,...,t i before the approximation at t i+1 is obtained, and because the error w j y(t j ) tends to increase with j,... so it seems reasonable to develop methods that use these more accurate previous data when approximating the solution at t i+1. Methods using the approximation at more than one previous mesh point to determine the approximation at the next point are called multistep methods. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 5 / 17
14 From One-Step to Multistep Methods Moving to Multistep Methods The approximate solution is available at each of the mesh points t 0, t 1,...,t i before the approximation at t i+1 is obtained, and because the error w j y(t j ) tends to increase with j,... so it seems reasonable to develop methods that use these more accurate previous data when approximating the solution at t i+1. Methods using the approximation at more than one previous mesh point to determine the approximation at the next point are called multistep methods. We will now give a precise definition of these methods, together with the definition of the two types of multistep methods. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 5 / 17
15 Outline 1 From One-Step to Multistep Methods 2 m-step Multistep Methods 3 Example 4-Step Multistep Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 6 / 17
16 An m-step Multistep Method Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 7 / 17
17 An m-step Multistep Method Definition An m-step multistep method for solving the initial-value problem y = f(t, y), a t b, y(a) = α has a difference equation for finding the approximation w i+1 at the mesh point t i+1 represented by the following equation, where m is an integer greater than 1: w i+1 = a m 1 w i + a m 2 w i a 0 w i+1 m + h [b m f(t i+1, w i+1 ) + b m 1 f(t i, w i ) + + b 0 f(t i+1 m, w i+1 m )] for i = m 1, m,...,n 1, where h = (b a)/n, the a 0, a 1,..., a m 1 and b 0, b 1,..., b m are constants, and the starting values w 0 = α, w 1 = α 1, w 2 = α 2,..., w m 1 = α m 1 are specified. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 7 / 17
18 An m-step Multistep Method w i+1 = a m 1 w i + a m 2 w i a 0 w i+1 m + h [b m f(t i+1, w i+1 ) + b m 1 f(t i, w i ) + + b 0 f(t i+1 m, w i+1 m )] Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 8 / 17
19 An m-step Multistep Method w i+1 = a m 1 w i + a m 2 w i a 0 w i+1 m + h [b m f(t i+1, w i+1 ) + b m 1 f(t i, w i ) + + b 0 f(t i+1 m, w i+1 m )] Explicit & Implicit Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 8 / 17
20 An m-step Multistep Method w i+1 = a m 1 w i + a m 2 w i a 0 w i+1 m + h [b m f(t i+1, w i+1 ) + b m 1 f(t i, w i ) + + b 0 f(t i+1 m, w i+1 m )] Explicit & Implicit Methods When b m = 0, the method is called explicit, or open, because the difference equation then gives w i+1 explicitly in terms of previously determined values. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 8 / 17
21 An m-step Multistep Method w i+1 = a m 1 w i + a m 2 w i a 0 w i+1 m + h [b m f(t i+1, w i+1 ) + b m 1 f(t i, w i ) + + b 0 f(t i+1 m, w i+1 m )] Explicit & Implicit Methods When b m = 0, the method is called explicit, or open, because the difference equation then gives w i+1 explicitly in terms of previously determined values. When b m 0, the method is called implicit, or closed, because w i+1 occurs on both sides of the difference equation, so w i+1 is specified only implicitly. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 8 / 17
22 Outline 1 From One-Step to Multistep Methods 2 m-step Multistep Methods 3 Example 4-Step Multistep Methods Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 9 / 17
23 The 4th-order Adams-Bashforth Method Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 10 / 17
24 The 4th-order Adams-Bashforth Method The equations w 0 = α w 1 = α 1 w 2 = α 2 w 3 = α 3 w i+1 = w i + h 24 [55f(t i, w i ) 59f(t i 1, w i 1 ) + 37f(t i 2, w i 2 ) 9f(t i 3, w i 3 )] for each i = 3, 4,...,N 1, define an explicit 4-step method known as the 4th-order Adams-Bashforth technique. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 10 / 17
25 The 4th-order Adams-Moulton Method Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 11 / 17
26 The 4th-order Adams-Moulton Method The equations w 0 = α w 1 = α 1 w 2 = α 2 w i+1 = w i + h 24 [9f(t i+1, w i+1 ) + 19f(t i, w i ) 5f(t i 1, w i 1 ) +f(t i 2, w i 2 )] for each i = 2, 3,...,N 1, define an implicit 3-step method known as the 4th-order Adams-Moulton technique. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 11 / 17
27 4th-Order Adams-Bashforth & Adams-Moulton Methods Starting Values & Accuracy Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 12 / 17
28 4th-Order Adams-Bashforth & Adams-Moulton Methods Starting Values & Accuracy The 4 or 3 starting values (in either explicit AB4 or implicit AM4) must be specified, generally by assuming w 0 = α and generating the remaining values by either a Runge-Kutta or Taylor method. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 12 / 17
29 4th-Order Adams-Bashforth & Adams-Moulton Methods Starting Values & Accuracy The 4 or 3 starting values (in either explicit AB4 or implicit AM4) must be specified, generally by assuming w 0 = α and generating the remaining values by either a Runge-Kutta or Taylor method. The implicit methods are generally more accurate then the explicit methods, but to apply an implicit method such as the Adams-Moulton Method directly, we must solve the implicit equation for w i+1. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 12 / 17
30 4th-Order Adams-Bashforth & Adams-Moulton Methods Starting Values & Accuracy The 4 or 3 starting values (in either explicit AB4 or implicit AM4) must be specified, generally by assuming w 0 = α and generating the remaining values by either a Runge-Kutta or Taylor method. The implicit methods are generally more accurate then the explicit methods, but to apply an implicit method such as the Adams-Moulton Method directly, we must solve the implicit equation for w i+1. This is not always possible, and even when it can be done the solution for w i+1 may not be unique. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 12 / 17
31 4th-order Adams-Bashforth Method Example Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 13 / 17
32 4th-order Adams-Bashforth Method Example Assume that we have used the Runge-Kutta method of order 4 with h = 0.2 to approximate the solutions to the initial value problem y = y t 2 + 1, 0 t 2, y(0) = 0.5 Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 13 / 17
33 4th-order Adams-Bashforth Method Example Assume that we have used the Runge-Kutta method of order 4 with h = 0.2 to approximate the solutions to the initial value problem y = y t 2 + 1, 0 t 2, y(0) = 0.5 The first four approximations were found to be y(0) = w 0 = 0.5, y(0.2) w 1 = , y(0.4) w 2 = , and y(0.6) w 3 = Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 13 / 17
34 4th-order Adams-Bashforth Method Example Assume that we have used the Runge-Kutta method of order 4 with h = 0.2 to approximate the solutions to the initial value problem y = y t 2 + 1, 0 t 2, y(0) = 0.5 The first four approximations were found to be y(0) = w 0 = 0.5, y(0.2) w 1 = , y(0.4) w 2 = , and y(0.6) w 3 = Use these as starting values for the 4th-order Adams-Bashforth method to compute new approximations for y(0.8) and y(1.0), and compare these new approximations to those produced by the Runge-Kutta method of order 4. Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 13 / 17
35 Example: 4th-order Adams-Bashforth Method Solution (1/3) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 14 / 17
36 Example: 4th-order Adams-Bashforth Method Solution (1/3) For the 4th-order Adams-Bashforth, Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 14 / 17
37 Example: 4th-order Adams-Bashforth Method Solution (1/3) For the 4th-order Adams-Bashforth, we have y(0.8) w 4 = w (55f(0.6, w 3) 59f(0.4, w 2 ) + 37f(0.2, w 1 ) 9f(0, w 0 )) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 14 / 17
38 Example: 4th-order Adams-Bashforth Method Solution (1/3) For the 4th-order Adams-Bashforth, we have y(0.8) w 4 = w (55f(0.6, w 3) 59f(0.4, w 2 ) + 37f(0.2, w 1 ) 9f(0, w 0 )) = (55f(0.6, ) 24 59f(0.4, ) + 37f(0.2, ) 9f(0, 0.5)) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 14 / 17
39 Example: 4th-order Adams-Bashforth Method Solution (1/3) For the 4th-order Adams-Bashforth, we have y(0.8) w 4 = w (55f(0.6, w 3) 59f(0.4, w 2 ) + 37f(0.2, w 1 ) 9f(0, w 0 )) = (55f(0.6, ) 24 59f(0.4, ) + 37f(0.2, ) 9f(0, 0.5)) = (55( ) 59( ) + 37( ) 9(1.5)) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 14 / 17
40 Example: 4th-order Adams-Bashforth Method Solution (1/3) For the 4th-order Adams-Bashforth, we have y(0.8) w 4 = w (55f(0.6, w 3) 59f(0.4, w 2 ) + 37f(0.2, w 1 ) 9f(0, w 0 )) = (55f(0.6, ) 24 59f(0.4, ) + 37f(0.2, ) 9f(0, 0.5)) = (55( ) = ( ) + 37( ) 9(1.5)) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 14 / 17
41 Example: 4th-order Adams-Bashforth Method Solution (2/3) and y(1.0) w 5 = w (55f(0.8, w 4) 59f(0.6, w 3 ) + 37f(0.4, w 2 ) 9f(0.2, w 1 )) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 15 / 17
42 Example: 4th-order Adams-Bashforth Method Solution (2/3) and y(1.0) w 5 = w (55f(0.8, w 4) 59f(0.6, w 3 ) + 37f(0.4, w 2 ) 9f(0.2, w 1 )) = (55f(0.8, ) 24 59f(0.6, ) + 37f(0.4, ) 9f(0.2, )) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 15 / 17
43 Example: 4th-order Adams-Bashforth Method Solution (2/3) and y(1.0) w 5 = w (55f(0.8, w 4) 59f(0.6, w 3 ) + 37f(0.4, w 2 ) 9f(0.2, w 1 )) = (55f(0.8, ) 24 59f(0.6, ) + 37f(0.4, ) 9f(0.2, )) = (55( ) 59( ) + 37( ) 9( )) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 15 / 17
44 Example: 4th-order Adams-Bashforth Method Solution (2/3) and y(1.0) w 5 = w (55f(0.8, w 4) 59f(0.6, w 3 ) + 37f(0.4, w 2 ) 9f(0.2, w 1 )) = (55f(0.8, ) 24 59f(0.6, ) + 37f(0.4, ) 9f(0.2, )) = (55( ) = ( ) + 37( ) 9( )) Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 15 / 17
45 Example: 4th-order Adams-Bashforth Method Solution (3/3) The error for these approximations at t = 0.8 and t = 1.0 are, respectively: = and = Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 16 / 17
46 Example: 4th-order Adams-Bashforth Method Solution (3/3) The error for these approximations at t = 0.8 and t = 1.0 are, respectively: = and = The corresponding Runge-Kutta approximations had errors: = and = Numerical Analysis (Chapter 5) Linear Multistep Methods R L Burden & J D Faires 16 / 17
47 Questions?
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