Table of Contents

Preface xi 1 Errors in Numerical Analysis 1 1.1 Enter Data Errors, 1 1.2 Approximation Errors, 2 1.3 Round-Off Errors, 3 1.4 Propagation of Errors, 3 1.4.1 Addition, 3 1.4.2 Multiplication, 5 1.4.3 Inversion of a Number, 7 1.4.4 Division of Two Numbers, 7 1.4.5 Raising to a Negative Entire Power, 7 1.4.6 Taking the Root of pth Order, 7 1.4.7 Subtraction, 8 1.4.8 Computation of Functions, 8 1.5 Applications, 8 Further Reading, 14 2 Solution of Equations 17 2.1 The Bipartition (Bisection) Method, 17 2.2 The Chord (Secant) Method, 20 2.3 The Tangent Method (Newton), 26 2.4 The Contraction Method, 37 2.5 The Newton--Kantorovich Method, 42 2.6 Numerical Examples, 46 2.7 Applications, 49 Further Reading, 52 3 Solution of Algebraic Equations 55 3.1 Determination of Limits of the Roots of Polynomials, 55 3.2 Separation of Roots, 60 3.3 Lagrange's Method, 69 3.4 The Lobachevski--Graeffe Method, 72 3.4.1 The Case of Distinct Real Roots, 72 3.4.2 The Case of a Pair of Complex Conjugate Roots, 74 3.4.3 The Case of Two Pairs of Complex Conjugate Roots, 75 3.5 The Bernoulli Method, 76 3.6 The Bierge--Vi'ete Method, 79 3.7 Lin Methods, 79 3.8 Numerical Examples, 82 3.9 Applications, 94 Further Reading, 109 4 Linear Algebra 111 4.1 Calculation of Determinants, 111 4.1.1 Use of Definition, 111 4.1.2 Use of Equivalent Matrices, 112 4.2 Calculation of the Rank, 113 4.3 Norm of a Matrix, 114 4.4 Inversion of Matrices, 123 4.4.1 Direct Inversion, 123 4.4.2 The Gauss--Jordan Method, 124 4.4.3 The Determination of the Inverse Matrix by its Partition, 125 4.4.4 Schur's Method of Inversion of Matrices, 127 4.4.5 The Iterative Method (Schulz), 128 4.4.6 Inversion by Means of the Characteristic Polynomial, 131 4.4.7 The Frame--Fadeev Method, 131 4.5 Solution of Linear Algebraic Systems of Equations, 132 4.5.1 Cramer's Rule, 132 4.5.2 Gauss's Method, 133 4.5.3 The Gauss--Jordan Method, 134 4.5.4 The LU Factorization, 135 4.5.5 The Schur Method of Solving Systems of Linear Equations, 137 4.5.6 The Iteration Method (Jacobi), 142 4.5.7 The Gauss--Seidel Method, 147 4.5.8 The Relaxation Method, 149 4.5.9 The Monte Carlo Method, 150 4.5.10 Infinite Systems of Linear Equations, 152 4.6 Determination of Eigenvalues and Eigenvectors, 153 4.6.1 Introduction, 153 4.6.2 Krylov's Method, 155 4.6.3 Danilevski's Method, 157 4.6.4 The Direct Power Method, 160 4.6.5 The Inverse Power Method, 165 4.6.6 The Displacement Method, 166 4.6.7 Leverrier's Method, 166 4.6.8 The L--R (Left--Right) Method, 166 4.6.9 The Rotation Method, 168 4.7 QR Decomposition, 169 4.8 The Singular Value Decomposition (SVD), 172 4.9 Use of the Least Squares Method in Solving the Linear Overdetermined Systems, 174 4.10 The Pseudo-Inverse of a Matrix, 177 4.11 Solving of the Underdetermined Linear Systems, 178 4.12 Numerical Examples, 178 4.13 Applications, 211 Further Reading, 269 5 Solution of Systems of Nonlinear Equations 273 5.1 The Iteration Method (Jacobi), 273 5.2 Newton's Method, 275 5.3 The Modified Newton's Method, 276 5.4 The Newton--Raphson Method, 277 5.5 The Gradient Method, 277 5.6 The Method of Entire Series, 280 5.7 Numerical Example, 281 5.8 Applications, 287 Further Reading, 304 6 Interpolation and Approximation of Functions 307 6.1 Lagrange's Interpolation Polynomial, 307 6.2 Taylor Polynomials, 311 6.3 Finite Differences: Generalized Power, 312 6.4 Newton's Interpolation Polynomials, 317 6.5 Central Differences: Gauss's Formulae, Stirling's Formula, Bessel's Formula, Everett's Formulae, 322 6.6 Divided Differences, 327 6.7 Newton-Type Formula with Divided Differences, 331 6.8 Inverse Interpolation, 332 6.9 Determination of the Roots of an Equation by Inverse Interpolation, 333 6.10 Interpolation by Spline Functions, 335 6.11 Hermite's Interpolation, 339 6.12 Chebyshev's Polynomials, 340 6.13 Mini--Max Approximation of Functions, 344 6.14 Almost Mini--Max Approximation of Functions, 345 6.15 Approximation of Functions by Trigonometric Functions (Fourier), 346 6.16 Approximation of Functions by the Least Squares, 352 6.17 Other Methods of Interpolation, 354 6.17.1 Interpolation with Rational Functions, 354 6.17.2 The Method of Least Squares with Rational Functions, 355 6.17.3 Interpolation with Exponentials, 355 6.18 Numerical Examples, 356 6.19 Applications, 363 Further Reading, 374 7 Numerical Differentiation and Integration 377 7.1 Introduction, 377 7.2 Numerical Differentiation by Means of an Expansion into a Taylor Series, 377 7.3 Numerical Differentiation by Means of Interpolation Polynomials, 380 7.4 Introduction to Numerical Integration, 382 7.5 The Newton--Cotes Quadrature Formulae, 384 7.6 The Trapezoid Formula, 386 7.7 Simpson's Formula, 389 7.8 Euler's and Gregory's Formulae, 393 7.9 Romberg's Formula, 396 7.10 Chebyshev's Quadrature Formulae, 398 7.11 Legendre's Polynomials, 400 7.12 Gauss's Quadrature Formulae, 405 7.13 Orthogonal Polynomials, 406 7.13.1 Legendre Polynomials, 407 7.13.2 Chebyshev Polynomials, 407 7.13.3 Jacobi Polynomials, 408 7.13.4 Hermite Polynomials, 408 7.13.5 Laguerre Polynomials, 409 7.13.6 General Properties of the Orthogonal Polynomials, 410 7.14 Quadrature Formulae of Gauss Type Obtained by Orthogonal Polynomials, 412 7.14.1 Gauss--Jacobi Quadrature Formulae, 413 7.14.2 Gauss--Hermite Quadrature Formulae, 414 7.14.3 Gauss--Laguerre Quadrature Formulae, 415 7.15 Other Quadrature Formulae, 417 7.15.1 Gauss Formulae with Imposed Points, 417 7.15.2 Gauss Formulae in which the Derivatives of the Function Also Appear, 418 7.16 Calculation of Improper Integrals, 420 7.17 Kantorovich's Method, 422 7.18 The Monte Carlo Method for Calculation of Definite Integrals, 423 7.18.1 The One-Dimensional Case, 423 7.18.2 The Multidimensional Case, 425 7.19 Numerical Examples, 427 7.20 Applications, 435 Further Reading, 447 8 Integration of Ordinary Differential Equations and of Systems of Ordinary Differential Equations 451 8.1 State of the Problem, 451 8.2 Euler's Method, 454 8.3 Taylor Method, 457 8.4 The Runge--Kutta Methods, 458 8.5 Multistep Methods, 462 8.6 Adams's Method, 463 8.7 The Adams--Bashforth Methods, 465 8.8 The Adams--Moulton Methods, 467 8.9 Predictor--Corrector Methods, 469 8.9.1 Euler's Predictor--Corrector Method, 469 8.9.2 Adams's Predictor--Corrector Methods, 469 8.9.3 Milne's Fourth-Order Predictor--Corrector Method, 470 8.9.4 Hamming's Predictor--Corrector Method, 470 8.10 The Linear Equivalence Method (LEM), 471 8.11 Considerations about the Errors, 473 8.12 Numerical Example, 474 8.13 Applications, 480 Further Reading, 525 9 Integration of Partial Differential Equations and of Systems of Partial Differential Equations 529 9.1 Introduction, 529 9.2 Partial Differential Equations of First Order, 529 9.2.1 Numerical Integration by Means of Explicit Schemata, 531 9.2.2 Numerical Integration by Means of Implicit Schemata, 533 9.3 Partial Differential Equations of Second Order, 534 9.4 Partial Differential Equations of Second Order of Elliptic Type, 534 9.5 Partial Differential Equations of Second Order of Parabolic Type, 538 9.6 Partial Differential Equations of Second Order of Hyperbolic Type, 543 9.7 Point Matching Method, 546 9.8 Variational Methods, 547 9.8.1 Ritz's Method, 549 9.8.2 Galerkin's Method, 551 9.8.3 Method of the Least Squares, 553 9.9 Numerical Examples, 554 9.10 Applications, 562 Further Reading, 575 10 Optimizations 577 10.1 Introduction, 577 10.2 Minimization Along a Direction, 578 10.2.1 Localization of the Minimum, 579 10.2.2 Determination of the Minimum, 580 10.3 Conjugate Directions, 583 10.4 Powell's Algorithm, 585 10.5 Methods of Gradient Type, 585 10.5.1 The Gradient Method, 585 10.5.2 The Conjugate Gradient Method, 587 10.5.3 Solution of Systems of Linear Equations by Means of Methods of Gradient Type, 589 10.6 Methods of Newton Type, 590 10.6.1 Newton's Method, 590 10.6.2 Quasi-Newton Method, 592 10.7 Linear Programming: The Simplex Algorithm, 593 10.7.1 Introduction, 593 10.7.2 Formulation of the Problem of Linear Programming, 595 10.7.3 Geometrical Interpretation, 597 10.7.4 The Primal Simplex Algorithm, 597 10.7.5 The Dual Simplex Algorithm, 599 10.8 Convex Programming, 600 10.9 Numerical Methods for Problems of Convex Programming, 602 10.9.1 Method of Conditional Gradient, 602 10.9.2 Method of Gradient's Projection, 602 10.9.3 Method of Possible Directions, 603 10.9.4 Method of Penalizing Functions, 603 10.10 Quadratic Programming, 603 10.11 Dynamic Programming, 605 10.12 Pontryagin's Principle of Maximum, 607 10.13 Problems of Extremum, 609 10.14 Numerical Examples, 611 10.15 Applications, 623 Further Reading, 626 Index 629

About the Author

PETRE TEODORESCU, PhD, is a Professor in the Faculty of Mathematics and Computer Science at the University of Bucharest in Romania and the author of 250 papers and twenty-eight books. NICOLAE-DORU STANESCU, PhD, is a Professor in the Faculty of Mechanics and Technology at the University of Pitesti in Romania and the author of 200 papers and ten books. NICOLAE PANDREA, PhD, is a Professor in the Faculty of Mechanics and Technology at the University of Pitesti in Romania and the author of 250 papers and six books.