Graphics Programs Reference
In-Depth Information
Chapter 11
Troubleshooting
In this chapter, we offer advice for dealing with some common problems that
you may encounter. We also list and describe the most common mistakes that
MATLAB users make. Finally, we offer some simple but useful techniques for
debugging your M-files.
Common Problems
Problems manifest themselves in various ways: Totally unexpected or plainly
wrong output appears; MATLAB produces an error message (or at least a
warning); MATLAB refuses to process an input line; something that worked
earlier stops working; or, worst of all, the computer freezes. Fortunately, these
problems are often caused by several easily identifiable and correctable mis-
takes. What follows is a description of some common problems, together with
a presentation of likely causes, suggested solutions, and illustrative examples.
We also refer to places in the topic where related issues are discussed.
Here is a list of the problems:
wrong or unexpected output,
syntax error,
spelling error,
error messages when plotting,
a previously saved M-file evaluates differently, and
computer won't respond.
Wrong or Unexpected Output
There are many possible causes for this problem, but they are likely to be
among the following:
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