Graphics Programs Reference
In-Depth Information
The result is a 3
×
1 matrix, in other words, a column vector.
MATLABhas many commands for manipulating matrices. You can read
about them in the section
More about Matrices
in Chapter 4 and in the online
help; some of them are illustrated in the section
Linear Economic Models
in
Chapter 9.
Suppressing Output
Typing a semicolon at the end of an input line suppresses printing of the
output of the MATLAB command. The semicolon should generally be used
when defining large vectors or matrices (such as
X = -1:0.1:2;
). It can
also be used in any other situation where the MATLAB output need not be
displayed.
Functions
In MATLAB you will use bothbuilt-in functions as well as functions that you
create yourself.
Built-in Functions
MATLAB has many built-in functions. These include
sqrt
,
cos
,
sin
,
tan
,
log
,
exp
, and
atan
(for arctan) as well as more specialized mathematical
functions suchas
gamma
,
erf
, and
besselj
. MATLAB also has several b
uilt
-
in constants, including
pi
(the number
π
),
i
(the complex number
i
=
√
−
1),
and
Inf
(
∞
). Here are some examples:
>> log(exp(3))
ans =
3
The function
log
is the natural logarithm, called “ln” in many texts. Now
consider
>> sin(2*pi/3)
ans =
0.8660
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