Numerical Analysis - Computer Science
[Pages:341]Numerical Analysis
Numerical Analysis L. Ridgway Scott
PRINCETON UNIVERSITY PRESS PRINCETON AND OXFORD
Copyright c 2011 by Princeton University Press Published by Princeton University Press, 41 William Street, Princeton, New Jersey 08540 In the United Kingdom: Princeton University Press, 6 Oxford Street, Woodstock, Oxfordshire OX20 1TW press.princeton.edu
All Rights Reserved Library of Congress Control Number: 2010943322
ISBN: 978-0-691-14686-7 British Library Cataloging-in-Publication Data is available
The publisher would like to acknowledge the author of this volume for typesetting this book using LATEX and Dr. Janet Englund and Peter Scott for providing the cover photograph
Printed on acid-free paper
Printed in the United States of America
10 9 8 7 6 5 4 3 2 1
Dedication
To the memory of Ed Conway1 who, along with his colleagues at Tulane University, provided a stable, adaptive, and inspirational starting point for my career.
1Edward Daire Conway, III (1937?1985) was a student of Eberhard Friedrich Ferdinand Hopf at the University of Indiana. Hopf was a student of Erhard Schmidt and Issai Schur.
Contents
Preface
xi
Chapter 1. Numerical Algorithms
1
1.1 Finding roots
2
1.2 Analyzing Heron's algorithm
5
1.3 Where to start
6
1.4 An unstable algorithm
8
1.5 General roots: effects of floating-point
9
1.6 Exercises
11
1.7 Solutions
13
Chapter 2. Nonlinear Equations
15
2.1 Fixed-point iteration
16
2.2 Particular methods
20
2.3 Complex roots
25
2.4 Error propagation
26
2.5 More reading
27
2.6 Exercises
27
2.7 Solutions
30
Chapter 3. Linear Systems
35
3.1 Gaussian elimination
36
3.2 Factorization
38
3.3 Triangular matrices
42
3.4 Pivoting
44
3.5 More reading
47
3.6 Exercises
47
3.7 Solutions
50
Chapter 4. Direct Solvers
51
4.1 Direct factorization
51
4.2 Caution about factorization
56
4.3 Banded matrices
58
4.4 More reading
60
4.5 Exercises
60
4.6 Solutions
63
viii
Chapter 5. Vector Spaces 5.1 Normed vector spaces 5.2 Proving the triangle inequality 5.3 Relations between norms 5.4 Inner-product spaces 5.5 More reading 5.6 Exercises 5.7 Solutions
Chapter 6. Operators 6.1 Operators 6.2 Schur decomposition 6.3 Convergent matrices 6.4 Powers of matrices 6.5 Exercises 6.6 Solutions
Chapter 7. Nonlinear Systems 7.1 Functional iteration for systems 7.2 Newton's method 7.3 Limiting behavior of Newton's method 7.4 Mixing solvers 7.5 More reading 7.6 Exercises 7.7 Solutions
Chapter 8. Iterative Methods 8.1 Stationary iterative methods 8.2 General splittings 8.3 Necessary conditions for convergence 8.4 More reading 8.5 Exercises 8.6 Solutions
Chapter 9. Conjugate Gradients 9.1 Minimization methods 9.2 Conjugate Gradient iteration 9.3 Optimal approximation of CG 9.4 Comparing iterative solvers 9.5 More reading 9.6 Exercises 9.7 Solutions
CONTENTS
65 66 69 71 72 76 77 79
81 82 84 89 89 92 95
97 98 103 108 110 111 111 114
115 116 117 123 128 128 131
133 133 137 141 147 147 148 149
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