append-e

# append-e - Matlab version 5 is a very powerful tool useful...

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Matlab version 5 is a very powerful tool useful for many kinds of mathematical tasks. For the purposes of this text, however, Matlab 5 will be used only to solve four types of problems: polynomial curve fitting, system of algebraic equations, system of ordinary differential equations, and nonlinear regression. This appendix serves as a quick guide to solving such problems. The solutions were all prepared using the Student Edition of Matlab 5. Please note that the Matlab 5 software must be purchased independently of the CD-ROM accompanying this book. E.1 A Quick Tour When Matlab is opened, the command window of the Matlab Student Edition appears: You may then type commands at the EDU» prompt. Throughout this appendix, different fonts are used to represent Matlab input and output , and italics are used to explain function arguments. E.1.1 Matlab's Method Matlab can range from acting as a calculator to performing complex matrix operations and more. All of Matlab's operations are performed as matrix operations, and every variable is stored in Matlab's memory as a matrix even if it is only 1x1 in size. Therefore, all Matlab input and output will be in matrix form.

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E.1.2 Punctuation Matlab is case sensitive and recognizes the difference between capital and lowercase letters. Therefore, it is possible to work with the variables "X" and "x" at the same time. The semicolon and period play very important roles in performing calculations using Matlab. A semicolon placed at the end of a command line will suppress restatement of that output. Matlab will still perform the command, but will not display the answer. For example, type beta=1+4 and Matlab will display the answer beta =5 , but if you then type alpha = 30/2; , Matlab will not tell you the answer. To see the value of a variable, simply type the name of the variable, alpha and Matlab will display its value , alpha =15. The command who can also be used to view a list of current variables: Your variables are: alpha beta The period is used when element-by-element matrix multiplication is performed. To perform standard matrix multiplication of two matrices, say "A" and "B," type A*B . To multiply every element of matrix "A" by 2 type A*2 . However, to multiply every element of "A" with the corresponding element of "B," one must type A.*B . This element-by-element matrix multiplication will be used for the purposes of this text. To learn more about Matlab, type demo at the command prompt; to see a demo about matrix manipulations, type matmanip . E.1.3 Help Matlab has an extensive on-line help program that can be accessed through the help command, the lookfor command, and by the helpwin command (or by choosing help from the menu bar). By typing "help topic," for example help log , Matlab will give an explanation of the topic. LOG
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append-e - Matlab version 5 is a very powerful tool useful...

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