Graphics Programs Reference
In-Depth Information
Chapter 5
MATLABGraphics
In this chapter we describe more of MATLAB's graphics commands and the
most common ways of manipulating and customizing them. You can get a
list of MATLAB graphics commands by typing
help graphics
(for general
graphics commands),
help graph2d
(for two-dimensional graphing),
help
graph3d
(for three-dimensional graphing), or
help specgraph
(for special-
ized graphing commands).
We have already discussed the commands
plot
and
ezplot
in Chapter 2.
We will begin this chapter by discussing more uses of these commands, as well
as the other most commonly used plotting commands in two and three dimen-
sions.Thenwewilldiscusssometechniquesforcustomizingandmanipulating
graphics.
Two-Dimensional Plots
Oftenonewantstodrawacurveinthe
x
-
y
plane,butwith
y
notgivenexplicitly
as a function of
x
. There are two main techniques for plotting such curves:
parametric plotting and contour or implicit plotting. We discuss these in turn
in the next two subsections.
ParametricPlots
Sometimes
x
and
y
arebothgivenasfunctionsofsomeparameter.Forexample,
the circle of radius 1 centered at (0,0) can be expressed in
parametric
form as
x
=
cos(2
π
t
),
y
=
sin(2
π
t
) where
t
runs from 0 to 1. Though
y
is not expressed
as a function of
x
, you can easily graphthis curve with
plot
, as follows:
>> T = 0:0.01:1;
67
Search WWH ::
Custom Search