MATLAB Basics - A Guide to MATLAB for Beginners and Experienced Users - page 26

Note that ^ has been replaced by .^. Now you can evaluate f1 on a vector:

>> f1(1:5)

ans =
3 7 13 21 31

You can plot f1 , using MATLAB graphics, in several ways that we will explore
in the next section. We conclude this section by remarking that one can also
define functions of two or more variables:

>> g = inline('uˆ2 + vˆ2', 'u', 'v')

g=

Inline function:
g(u,v) = u^2+v^2

Graphics

In this section, we introduce MATLAB's two basic plotting commands and
show how to use them.

Graphing with ezplot
The simplest way to graph a function of one variable is with ezplot , which
expects a string or a symbolic expression representing the function to be plot-
ted. For example, to graph x 2

+ x + 1 on the interval − 2 to 2 (using the string

form of ezplot ), type

>> ezplot('xˆ2+x+1',[-22])

The plot will appear on the screen in a new window labeled “Figure No. 1”.
We mentioned that ezplot accepts either a string argument or a symbolic
expression.Usingasymbolicexpression,youcanproducetheplotinFigure2-4
withthe following input:

>> syms x
>> ezplot(xˆ2+x+1,[-22])

Graphs can be misleading if you do not pay attention to the axes. For
example, the input ezplot(xˆ2+x+3,[-22]) produces a graph