Engineering Analysis Interactive Methods and Programs with FORTRAN, QuickBASIC, MATLAB, and Mathematica Y. C. Pao CRC Press Boca Raton London New York Washington, D.C. © 2001 by CRC Press LLC Acquiring Editor: Cindy Renee Carelli Project Editor: Albert W. Starkweather, Jr. Cover design: Dawn Boyd Library of Congress Cataloging-in-Publication Data Catalog record is available from the Library of Congress This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated. A wide variety of references are listed. Reasonable efforts have been made to publish reliable data and information, but the author and the publisher cannot assume responsibility for the validity of all materials or for the consequences of their use. Neither this book nor any part may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, microfilming, and recording, or by any information storage or retrieval system, without prior permission in writing from the publisher. The consent of CRC Press LLC does not extend to copying for general distribution, for promotion, for creating new works, or for resale. Specific permission must be obtained in writing from CRC Press LLC for such copying. Direct all inquiries to CRC Press LLC, 2000 Corporate Blvd., N.W., Boca Raton, Florida 33431. Trademark Notice: Product or corporate names may be trademarks or registered trademarks, and are only used for identification and explanation, without intent to infringe. Mathematica® is developed by Wolfram Research, Inc., Champaign, IL. Windows® is developed by Microsoft Corp., Redmond, WA. © 1999 by CRC Press LLC No claim to original U.S. Government works International Standard Book Number 0-8493-2016-X Printed in the United States of America 1 2 3 4 5 6 7 8 9 0 Printed on acid-free paper © 2001 by CRC Press LLC Files Available from CRC Press FORTRAN, QuickBASIC, MATLAB, and Mathematic files, which contain the source and executable programs associated with this book are available from CRC Press’ website — http://www.crcpress.com. Before downloading, prepare two 3.5-inch, high-density disks — one for the files and one for a backup. Also create a temporary directory named on your hard drive, which will expedite downloading. To download these files, type: http://www.crcpress.com/us/ElectronicProducts/downandup.asp .(cid:13)W(cid:10) hen prompted, enter 2016 under name and crcpress under password. Then store the files in the folder. If you encounter a problem, call 1-800-CRC-PRES (272-7737). The dowloaded files may be copied to a 3.5-inch disk. The temporary folder then may be deleted. Don’t forget to make a backup copy of your 3.5-inch disk. There are four subdirectories , , , and which contain the FORTRAN source and executable programs, QuickBASIC source and executable programs, m files of MATLAB, and input and output statements of for the Mathematica operations depicted in this textbook, respectively: 1. has the following files: Bairstow.FOR CharacEquationFOR CubeSpln.FOR DiffTabl.FOR EditFOR.EXE EigenVec.FOR EigenvIt.FOR ExactFit.FOR FindRoot.FOR FOR1.EXE FOR2.EXE FORTRAN.LIB Gauss.FOR GauJor.FOR LagrangI.FOR LeastSq1.FOR LeastSqG.FOR LINK.EXE MatxInvD.FOR NewRaphG.FOR NuIntgra.FOR OdeBvpFD.FOR OdeBvpRK.FOR ParabPDE.FOR Relaxatn.FOR RungeKut.FOR Volume.FOR WavePDE.FOR EDITFOR.EXE is provided for re-editing the *.FOR source programs such as Bairstow.FOR, CubeSpln.FOR, etc. (refer to the FORTRAN programs index) to include supplementary subprograms describing the problem which need to be solved interactively. To re-edit, insert the 3.5-inch disk into Drive A and when the a:\ prompt shows, type cd fortran to switch to the subdirectory. For example, to solve a polynomial by the Bairstow’s method one needs to define the polynomial, for which the roots are to be computed. To reedit Bairstow.FOR, the user enters a:\editfor Bairstow.for to add new FORTRAN statements or change them. Notice that both upper and lower case characters are acceptable. While creating a new version of Bairstow.FOR, the old version will be saved in Bairstow.BAK. To create an object file, FOR1 filename such as Bairstow.FOR and FOR2 need to be implemented. A BAISTOW.OBJ will then be generated. For linking with the FORTRAN library functions, FORTRAN.LIB, one enters, for example, LINK Bairstow to create an executable file Bairstow.EXE. To run, the user simply types Bairstow after the prompt A:\ and then answers questions interactively. © 2001 by CRC Press LLC 2. has the following files: Select.BAS Select.EXE Bairstow.EXE BRUN40.EXE CharacEq.EXE CubeSpln.EXE EigenStb.EXE EigenVec.EXE EigenVib.EXE EigenvIt.EXE ExactFit.EXE FindRoot.EXE Gauss.EXE LagrangI.EXE LeastSq1.EXE LeastSqG.EXE MatxInvD.EXE NuIntgra.EXE OdeBvpFD.EXE OdeBvpRK.EXE ParabPDE.EXE QB.EXE Relaxatn.EXE RungeKut.EXE Volume.EXE Bairstow.QB CharacEq.QB CubeSpln.QB DiffTabl.QB EigenStb.QB EigenVec.QB EigenVib.QB EigenvIt.QB ExactFit.QB FindRoot.QB GauJor.QB Gauss.QB LagrangI.QB LeastSq1.QB LeastSqG.QB MatxAlgb.QB MatxMtpy.QB NewRaphG.QB NuIntgra.QB OdeBvpFD.QB OdeBvpRK.QB ParabPDE.QB Relaxatn.QB RungeKut.QB Volume.QB WavePDE.QB To commence QuickBASIC, when a:\ is prompted on screen, the user enters QB. QB.EXE and BRUN40.EXE therefore are included in . The program Select enables user to select the available QuickBASIC program in this textbook. After user responds with C:\Select, the screen shows a menu as shown in Figure 1 and user then follow the screen help-messages to run a desired program. 3. is a subdirectory associated with MATLAB and has the following files: BVPF.m DerivatF.m DiffTabl.m EigenvIt.m F.m FindRoot.m FP.m Functns.m FuncZ.m FuncZnew.m FunF.m GauJor.m integrnd.m LagrangI.m LeastSqG.m NewRaphG.m ParabPDE.m Relaxatn.m Volume.m Warping.m WavePDE.m When the 3.5-inch disk containing all of these m files is in Drive A, any of these files can be accessed by enclosing the filename inside a pair of parentheses as illustrated in Section 3.2 where F.m and FP.m are required for FindRoot.m and in Section 5.2 where an integrand function integrnd.m is defined for numerical integration. If all files have been added into MATLAB library m files, then no reference to the Drive A is necessary and the pair of parentheses can also be dropped. 4. is a subdirectory associated with Mathematica and has the files of: Bairstow.MTK CubeSpln.MTK DiffTabl.MTK EigenVec.MTK ExactFit.MTK FindRoot.MTK FUNCTNS.MTK EigenvIt.MTK Gauss.MTK GauJor.MTK LagrangI.MTK LeastSq1.MTK LeastSqG.MTK MatxAlgb.MTK NewRaphG.MTK NuIntgra.MTK OdeBvpFD.MTK OdeBvpRK.MTK ParabPDE.MTK Rexalatn.MTK RungeKut.MTK Volume.MTK WavePDE.MTK © 2001 by CRC Press LLC Any of the above programs can be executed by Mathematica via mouse oper- ation. First, by clicking the File option and when the pull-down menu appears, select Open and then enter the filename such as a:\Mathtica\MatxAlgb.MTK (assuming the 3.5-inch disk containing is in Drive A) and press the Enter key. When all lines of this file is displayed on screen, move cursor to any input line such as In[1]: A = {{1,2},{3,4}}; MatrixForm[A] and hit the Enter key. Mathematica will respond by repeating those lines for Out[1]. Hence, user can reproduce all of the output lines by sequentially running the input lines [1] through [9]. However, if user first run In[1] and then In[3], Mathematica cannot perform the addition of [A] because [B] is not defined. If after having run In[1], user selects In[5], or, In[6], Mathematica then has no problem of giving out results. FIGURE 1. The Select screen. © 2001 by CRC Press LLC Dedication This book is dedicated to Prof. E. J. Marmo, who offered a congenial work-environment for the author to grow in the computer-aided engineering field. © 2001 by CRC Press LLC Preface and Acknowledgments Writing textbooks on topics in the field of Computer Aided Engineering (CAE) indeed has been a very satisfying experience. First, I had the pleasure of being a coauthor with Prof. Thomas C. Smith of the book Introduction to Digital Computer Plotting by Gordon & Breach in 1973. The book Elements of Computer-Aided Design and Manufacturing, CAD/CAM, was published in 1982 by John Wiley & Sons. The book A First Course in Finite Element Analysis published by Allyn & Bacon followed in 1986, and Engineering Drafting and Solid Modeling with Silver- Screen, published by CRC Press, appeared in 1993. Having taught the subjects of computer methods for engineering analysis since 1966, I finally have the courage to organize this textbook out of a large volume of classroom notes collected over the past 31 years. The rapid growth of computer technology is difficult for any one to keep pace, and to make revision of textbooks in the CAE field. However, the computational methods developed by the pioneers, such as Euler, Gauss, Lagrange, Newton, and Runge, continue to serve us incredibly effective. These computational algorithms remain classic, only are now executed with modern computer technology. As far as the programming languages are concerned, FORTRAN has been dominating the scientific fields for many decades. BASIC considered by many to be too plain and cumbersome while C is considered by others to be too sophisticated; both, however, are gaining popularity and increasingly replacing FORTRAN in the computational community. This is particularly true when QuickBASIC was intro- duced by Microsoft. MATLAB and Mathematica developed by the MathWorks, Inc. and Wolfram Research, Inc., respectively both contain a vast collection of files (similar to FOR- TRAN’s library functions) which can perform the often-encountered computational problems. For implementation, the MATLAB and Mathematica instructions to be interactively entered through keyboard are extremely simple. And, it also provides very easy-to-use graphic output. When students find it too easy to use, they often become uninterested in learning what are the methods involved. This text is prepared with FORTRAN, QuickBASIC, MATLAB and Mathematica, and more impor- tantly gives the algorithms involved in the methods. Ample number of sample problems are solved to demonstrate how the developed programs should be interactively applied. Furthermore, the development of the user-generated supplementary files is emphasized so that more supporting subprograms can be added to the MATLAB m-files and Mathematica toolkits. It is a text for self-study as well as for the need of general references. Numerous friends, colleagues, and students have assisted in collecting the materials assembled herein, and they have made a great number of constructive suggestions for the betterment of this work. To them, I am most grateful. Especially, I would like to © 2001 by CRC Press LLC thank my long-time friends Dr. H. C. Wang, formerly with the IBM Thomas Watson Research Laboratory and now with the Industrial Research Institutes in Hsingchu, Taiwan; Dr. Erik L. Ritman of the Mayo Clinic in Rochester, MN, and Leon Hill of the Boeing Company in Seattle, WA, for their help and encouragement throughout my career in the CAE field. Profs. R. T. DeLorm, L. Kersten, C. W. Martin, R. N. McDougal, G. M. Smith, and E. J. Marmo had assisted in acquiring equipment and research funds which made my development in the CAE field possible, I extend my most sincere gratitude to these colleagues at the University of Nebraska–Lincoln. For providing constructive inputs to my published works, I should give credits to Prof. Gary L. Kinzel of the Ohio State University, Prof. Donald R. Riley of the University of Minnesota, Dr. L. C. Chang of the General Motors’ EDS Division, Dr. M. Maheshiwari and Mr. Steve Zitek of the Brunswick Corp., my former graduate assistants J. Nikkola, T. A. Huang, K. A. Peterson, Dr. W. T. Kao, Dr. David S. S. Shy, C. M. Lin, R. M. Sedlacek, L. Shi, J. D. Wilson, Dr. A. J. Wang, Dave Breiner, Q. W. Dong, and Michael Newman, and former students Jeff D. Geiger, Tim Car- rizales, Krishna Pendyala, S. Ravikoti, and Mark Smith. I should also express my appreciation to the readers of my other four textbooks mentioned above who have frequently contacted me and provided input regarding various topics that they would like to be considered as connected to the field of CAE and numerical problems that they would like to be solved by application of computer. Such input has proven to be invaluable to me in preparation of this text. CRC Press has been a delightful partner in publishing my previous book and again this book. The completion of this book would not be possible without the diligent effort and superb coordination of Cindy Renee Carelli, Suzanne Lassandro, and Albert Starkweather, I wish to express my deepest appreciation to them and to the other CRC editorial members. Last but not least, I thank my wife, Rosaline, for her patience and encouragement. Y. C. Pao © 2001 by CRC Press LLC Contents 1 Matrix Algebra and Solution of Matrix Equations 1.1 Introduction 1.2 Manipulation of Matrices 1.3 Solution of Matrix Equation 1.4 Program Gauss — Gaussian Elimination Method 1.5 Matrix Inversion, Determinant, and Program MatxInvD 1.6 Problems 1.7 Reference 2 Exact, Least-Squares, and Spline Curve-Fits 2.1 Introduction 2.2 Exact Curve Fit 2.3 Program LeastSq1 — Linear Least-Squares Curve-Fit 2.4 Program LeastSqG — Generalized Least-Squares Curve-Fit 2.5 Program CubeSpln — Curve Fitting with Cubic Spline 2.6 Problems 2.7 Reference 3 Roots of Polynomial and Transcendental Equations 3.1 Introduction 3.2 Iterative Methods and Program Roots 3.3 Program NewRaphG — Generalized Newton-Raphson Iterative Method 3.4 Program Bairstow — Bairstow Method for Finding Polynomial Roots 3.5 Problems 3.6 References 4 Finite Differences, Interpolation, and Numerical Differentiation 4.1 Introduction 4.2 Finite Differences and Program DiffTabl — Constructing Difference Table 4.3 Program LagrangI — Applications of Lagrangian Interpolation Formula 4.4 Problems 4.5. Reference 5 Numerical Integration and Program Volume 5.1 Introduction 5.2 Program NuIntGra — Numerical Integration by Application of the Trapezoidal and Simpson Rules © 2001 by CRC Press LLC 5.3 Program Volume — Numerical Solution of Double Integral 5.4 Problems 5.5 References 6 Ordinary Differential Equations — Initial and Boundary Value Problems 6.1 Introduction 6.2 Program RungeKut — Application of Runge-Kutta Method for Solving InitialValue Problems 6.3 Program OdeBvpRK — Application of Runge-Kutta Method for Solving Boundary Value Problems 6.4 Program OdeBvpFD — Application of Finite-Difference Method for Solving Boundary-Value Problems 6.5 Problems 6.6 References 7 Eigenvalue and Eigenvector Problems 7.1 Introduction 7.2 Programs EigenODE.Stb and EigenODE.Vib — for Solving Stability and Vibration Problems 7.3 Program CharacEq — Derivation of Characteristic Equation of a Specified Square Matrix 7.4 Program EigenVec — Solving Eigenvector by Gaussian Elimination Method 7.5 Program EigenvIt — Iterative Solution of Eigenvalue and Eigenvector 7.6 Problems 7.7 References 8 Partial Differential Equations 8.1 Introduction 8.2 Program ParabPDE — Numerical Solution of Parabolic Partial Differential Equations 8.3 Program Relaxatn — Solving Elliptical Partial Differential Equations by Relaxation Method 8.4 Program WavePDE — Numerical Solution of Wave Problems Governed by Hyperbolic Partial Differential Equations 8.5 Problems 8.6 References © 2001 by CRC Press LLC

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