MATLAB Programming

3 Basic Program Components
Asterisk — *
An asterisk in a filename specification is used as a wildcard specifier, as
described below.
Filename Wildcard
Wildcards are generally used in file operations that act on multiple files or
directories. They usually appear in the string containing the file or directory
specification. MATLAB matches all characters in the name exactly except for
the wildcard character *, which can match any one or more characters.
To locate all files with names that start with 'january_' and have a mat
file extension, use
dir('january_*.mat')
You can also use wildcards with the who and whos functions. To get
information on all variables with names starting with 'image' and ending
with 'Offset', use
whos image*Offset
At — @
The @ sign signifies either a function handle constructor or a directory that
supports a MATLAB class.
Function Handle Constructor
The @ operator forms a handle to either the named function that follows the @
sign, or to the anonymous function that follows the @ sign.
Function Handles in General. Function handles are commonly used in
passing functions as arguments to other functions. Construct a function
handle by preceding the function name with an @ sign:
fhandle = @myfun
You can read more about function handles in “Function Handles” on page 4-23.
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