Chapter 4: Programming in Matlab - College of the Redwoods

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378 Chapter 4 Programming in Matlab
Section 4.5 Subfunctions in Matlab 379 4.5 Subfunctions in Matlab Up to this point, our programs have been fairly simple, usually taking on a single task, such as solving a quadratic equation. As programs become more complex and perform multiple tasks, modern programmers break programs into a series of self contained modules. In this manner, various parts of the program can be written separately, tested, and once stable, can be integrated into the program as a whole. In older programming languages, these modules were known as subroutines. In modern, object oriented languages such as C++ and Java, the modules are objects, created from classes, that contain their own variables and methods for manipulating data and performing tasks. These objects can then be reused and assembled to create sophisticated programs. To attack a complex programming task in Matlab, we must first break the task up into manageable units. Each of these units or modules are then coded as functions and tested until we are certain they perform the simple task for which they are designed. Once satisfied that the individual functions are performing as designed, we must then integrate them into a complete and functioning program. In this section we will discuss two ways that we can accomplish this modular design. 1. We can write each of the modules as functions in separate files. We then write a master script file which calls each of the function M-files as needed. 2. We can write a primary function in place of the script file. We can then incorporate the modules as subfunctions directly in this primary function file. That is, we write one self contained file. Actually there is also a third way to proceed. We can write a primary file in place of a script file. However, by signalling the end of this primary function with the Matlab keyword end, we signal Matlab that out subfunctions (each of which must also use the keyword end) are nested functions. A primary function written in this manner emulates some of the behavior of an object in an object oriented language, with its own variables and methods (subfunctions). We’ll see in a later section that the rules for variable scope will change significantly when using nested functions. We will investigate each of these options in some detail. In the next section, we investigate the first of these options, calling a function M-file from within the body of a script M-file. 12 Copyrighted material. See: http://msenux.redwoods.edu/Math4Textbook/
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4 Programming In Matlab In this cha
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Section 4.1 Logical Arrays 261 4.1
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