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<HTML>
<HEAD>
<TITLE>Scalar variables</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<P><A NAME="variablescalar"></A>
<font size="+2" color="green">Scalar variables</font></P>
<P>
A scalar is a single valued double precision real numeric variable. A
scalar can be used wherever a single numeric value is expected.
Indices have no meaning, and so are not allowed on scalars.</P>
<P>
A literal scalar can be a single number, such as, <CODE>3.456</CODE>, or an
expression that results in a single number, such as
<code>LEN(x)+2</code>.</P>
<P>
The following table shows the possible ways that variables can be
considered to be equivalent to scalars, that is, can be used
wherever scalars are expected.</P>
<p>
<center><table border="1" cols="1">
<tr>
<td bgcolor="#FFCCCC">Let <code>a</code> and <code>b</code> be scalars<br />
Suppose that <code>M</code> is a matrix, <code>V</code> is a vector, and <code>S</code>
is a scalar</td>
</tr><tr>
<td><table cellpadding="1" cols="3">
<tr>
<td><code>S</code></td><td>=</td><td>the value of <code>S</code></td>
</tr><tr>
<td><code>V[a]</code></td><td>=</td><td>the value stored in the <code>a</code><sup><i>th</i></sup>
element of <code>V</code></td>
</tr><tr>
<td><code>M[a,b]</code></td><td>=</td><td>the value stored in row <code>a</code> and
column <code>b</code> of <code>M</code></td></tr>
</table></td></tr></table>
</center></p>
<P>
<a href="variablename.htm"><img src="../shadow_left.gif">
<font size="+1" color="olive">Variable names</font></a><br />
<a href="vectorvariable.htm"><img src="../shadow_right.gif">
<font size="+1" color="olive">Vector variables</font></a>
</P>
</body>
</html>
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