Graphics Programs Reference

In-Depth Information

Set

Getting Started with MATLAB
will download a portable docu-

ment format (PDF) version of the
Getting Started with MATLAB
man-

ual.

You can learn how to use any matlab command by typing
help

followed by the name of the command, for example,
help sin
.

You can also use the
lookfor
command, which searches the help

entries for all matlab commands for a particular word. For example, if

you want to know which matlab functions to use for spectral analysis,

you could type
lookfor spectrum
. matlab responds with the names

of the commands that have the searched word in the first line of the help

entry. You can search the entire help entry for all matlab commands

by typing
lookfor -all
keyword
.

→

1.2 First Steps

To get matlab to work out 1+1, type the following at the prompt:

1+1

matlab responds with

ans =

2

The answer to the typed command is given the name
ans
. In fact
ans

is now a variable that you can use again. For example you can type

ans*ans

to check that 2

×

2=4:

ans*ans

ans =

4

matlab has updated the value of
ans
to be 4.

The spacing of operators in formulas does not matter. The following

formulas both give the same answer:

1+3 * 2-1 / 2*4

1+3*2-1/2*4

The order of operations is made clearer to readers of your matlab code

if you type carefully:

1 + 3*2 - (1/2)*4