Graphics Programs Reference
In-Depth Information
➱
Missing multiplication operators and parentheses are among the
most common errors.
You can edit an input line by using the
UP-ARROW
key to redisplay the pre-
vious command, editing the command using the
LEFT-
and
RIGHT-ARROW
keys,
and then pressing
RETURN
or
ENTER
.The
UP-
and
DOWN-ARROW
keys allow you
to scroll back and forththroughall the commands you've typed in a MATLAB
session, and are very useful when you want to correct, modify, or reenter a
previous command.
Online Help
ThereareseveralwaystogetonlinehelpinMATLAB.Togethelponaparticu-
lar command, enter
help
followed by the name of the command. For example,
help solve
will display documentation for
solve
. Unless you have a large
monitor, the output of
help solve
will not fit in your MATLAB command
window, and the beginning of the documentation will scroll quickly past the
top of the screen. You can force MATLAB to display information one screen-
ful at a time by typing
more on
. You press the space bar to display the next
screenful,or
ENTER
todisplaythenextline;type
help more
fordetails.Typing
more on
affects all subsequent commands, until you type
more off
.
The command
lookfor
searches the first line of every MATLAB help file
for a specified string (use
lookfor -all
to searchall lines). For example,
if you wanted to see a list of all MATLAB commands that contain the word
“factor” as part of the command name or brief description, then you would
type
lookfor factor
. If the command you are looking for appears in the
list, then you can use
help
on that command to learn more about it.
The most robust online help in MATLAB 6 is provided through the vastly
improved Help Browser. The Help Browser can be invoked in several ways: by
typing
helpdesk
at the command prompt, under the
View
item in the menu
bar, or through the question mark button on the tool bar. Upon its launch you
will see a window with two panes: the first, called the
Help Navigator
, used
to find documentation; and the second, called the
display pane
, for viewing
documentation. The display pane works much like a normal web browser. It
has an address window, buttons for moving forward and backward (among the
windows you have visited), live links for moving around in the documentation,
the capability of storing favorite sites, and other such tools.
You use the Help Navigator to locate the documentation that you will ex-
plore in the display pane. The Help Navigator has four tabs that allow you to
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