MATLAB Programming

Nested Functions
Type of Operation
Evaluating an expression using
eval or evalin, or assigning a
variable with assignin
Loading variables from a
MAT-file with the load function
Assigning to a variable in a
MATLAB script
Assigning to a variable in the
MATLAB debugger
How to Avoid Using Dynamic
Assignment
As a general suggestion, it is best to avoid
using the eval, evalin, andassignin
functions altogether.
Use the form of load that returns a
MATLAB structure.
Convert the script to a function, where
argument- and result-passing can often
clarify the code as well.
You can declare the variable to be
global. For example, to create a variable
X for temporary use in debugging, use
K>> global X;
X = value
One way to avoid this error in the other cases is to pre-declare the variable in
the desired function.
Examples of Nested Functions
This section shows a few examples of how you can use nested functions. These
examples are intended to show you how to program with this type of function.
For more mathematically oriented examples, see the MATLAB Mathematics
documentation.
Theexamplesinthissectioninclude
• “Example 1 — Creating a Function Handle for a Nested Function” on page
5-27
• “Example 2 — Function-Generating Functions” on page 5-29
Example 1 — Creating a Function Handle for a Nested Function
The following example constructs a function handle for a nested function and
then passes the handle to the MATLAB fplot function to plot the parabola
5-27