CHAPTER 6 MATLAB Programs CONTENTS KEY TERMS functions that return subfunction debugging more than one value functions that do not return any values side effects menu-driven program variable scope base workspace local variable syntax errors run-time errors logical errors tracing call-by-value modular programs main program main function main function global variable persistent variable declaring variables breakpoints breakpoint alley function stubs live script local function bug code cells Chapter 3 introduced scripts and user-defined functions. In that chapter, we saw how to write scripts, which are sequences of statements that are stored in MATLAB code files and then executed. We also saw how to write user-defined functions, also stored in MATLAB code files (either in their own or in scripts) that calculate and return a single value. In this chapter, we will expand on these concepts and introduce other kinds of user-defined functions. We will show how ® MATLAB programs consist of combinations of scripts and user-defined functions. The mechanisms for interactions of variables in code files and the Command Window will be explored. Techniques for finding and fixing mistakes in programs will be reviewed. Finally, the use of live scripts created by the Live Editor (new as of R2016a) and using code cells in scripts will be introduced. 6.1 MORE TYPES OF USER-DEFINED FUNCTIONS We have already seen how to write a user-defined function that calculates and returns one ...
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