By Hans Petter Langtangen

ISBN-10: 3642183654

ISBN-13: 9783642183652

The booklet serves as a primary advent to laptop programming of medical functions, utilizing the high-level Python language. The exposition is instance- and problem-oriented, the place the functions are taken from arithmetic, numerical calculus, facts, physics, biology, and finance. The booklet teaches "Matlab-style" and procedural programming in addition to object-oriented programming. highschool arithmetic is a required historical past, and it really is helpful to check classical and numerical one-variable calculus in parallel with analyzing this ebook. along with studying how you can software desktops, the reader also will the best way to resolve mathematical difficulties, bobbing up in a variety of branches of technology and engineering, using numerical tools and programming. by means of mixing programming, arithmetic and clinical functions, the publication lays a high-quality beginning for working towards computational technology.

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Many also use the word application in the same meaning as program and code. A related term is source code, which is the same as the text that constitutes the program. You find the source code of a program in one or more text files12 . We talk about running a program, or equivalently executing a program or executing a file. The file we execute is the file in which the program text is stored. This file is often called an executable or an application. The program text may appear in many files, but the executable is just the single file that starts the whole program when we run that file.

1. 1. 05095 We see that the result of the calculation has changed, as expected. 6 Verifying the Result We should always carefully control that the output of a computer program is correct. You will experience that in most of the cases, at least until you are an experienced programmer, the output is wrong, and you have to search for errors. In the present application we can simply use a calculator to control the program. 2342 is the correct solution to our mathematical problem. 7 Using Variables When we want to evaluate y(t) for many values of t, we must modify the t value at two places in our program.

First, we must understand how a problem can be solved by giving a sequence of instructions to the computer. This is usually the most difficult thing with programming. Second, we must express this sequence of instructions correctly in a computer language and store the corresponding text in a file (the program). Third, we must run the program, check the validity of the results, and usually enter a fourth phase where errors in the program must be found and corrected. Mastering this process requires a lot of training, which implies making a large number of programs (exercises in this book, for instance) and getting the programs to work.

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A Primer on Scientific Programming with Python by Hans Petter Langtangen

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