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args.html
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<html>
<head>
<title>
ARGS - Command Line Argument Retrieval
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
ARGS <br> Command Line Argument Retrieval
</h1>
<hr>
<p>
<b>ARGS</b>
is a MATLAB program which
demonstrates command line argument retrieval.
</p>
<p>
In particular, <b>ARGS</b> is a demonstration of the NARGIN function,
which counts command line arguments and the
VARARGIN function, which allows the user to specify that a routine
has a variable number of input arguments.
</p>
<p>
If a MATLAB function takes input arguments, such as
<pre>
function value = summer ( alpha, beta )
</pre>
then there are two ways of supplying some or all the argument
values when invoking the function.
</p>
<p>
We can call with commandline arguments:
<pre>
value = summer
or
value = summer 2
or
value = summer 2 4
</pre>
or with functional arguments:
<pre>
value = summer ( )
or
value = summer ( 2 )
or
value = summer ( 2, 4 )
</pre>
as long as the arguments are processed correctly.
</p>
<p>
In the commandline form, the arguments
will be given to the function as character strings, which must
be re-interpreted as numbers. A convenient way to allow the user
to use either way of invoking the function requires that the
function include a check as to the type of value it has
been given. For example, to handle ALPHA, we might write
<pre>
if ( nargin < 1 )
alpha = input ( 'Enter value of alpha: ' );
elseif ( ischar ( alpha ) )
alpha = str2num ( alpha );
end
</pre>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>ARGS</b> is available in
<a href = "../../c_src/args/args.html">a C version</a> and
<a href = "../../cpp_src/args/args.html">a C++ version</a> and
<a href = "../../f77_src/args/args.html">a FORTRAN77 version</a> and
<a href = "../../f_src/args/args.html">a FORTRAN90 version</a> and
<a href = "../../java_src/args/args.html">a JAVA version</a> and
<a href = "../../m_src/args/args.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "args.m">args.m</a>, the source code;
</li>
<li>
<a href = "summer.m">summer.m</a>, a function which
will compute the sum of its two arguments. The function
can be invoked using the commandline or functional form;
some or all of the arguments may be omitted, in which case
the function will request them.
</li>
<li>
<a href = "timestamp.m">timestamp.m</a>,
prints the current YMDHMS date as a timestamp;
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "args_output.txt">args_output.txt</a>,
the output of the command <b>args ( 'Joe', 'Gorilla', 'Shazam' )</b>;
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../m_src.html">
the MATLAB source codes</a>.
</p>
<hr>
<i>
Last revised on 21 April 2013.
</i>
<!-- John Burkardt -->
</body>
</html>