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<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" type="guide" id="variable">
<info>
<link type="guide" xref="index#equation"/>
</info>
<title>Variables</title>
<p>
To assign a value to a variable use the = symbol or choose the variable to assign to with the <gui>→R</gui> button in <link xref="mouse">advanced mode</link>.
A variable name must only contain upper or lower characters.
</p>
<example>
<p>
x=5
</p>
<p>
value=82
</p>
</example>
<p>
Variables can be used in any equation and are substituted for their assigned value.
Variables can be inserted using the <gui>←R</gui> button.
</p>
<example>
<p>
6x+3
</p>
<p>
xy−3x+7y−21
</p>
</example>
<p>
The following variables are always defined.
</p>
<table>
<tr>
<td><p>ans</p></td>
<td><p>Result of previous calculation</p></td>
</tr>
<tr>
<td><p>e</p></td>
<td><p><link xref="logarithm">Euler's Number</link></p></td>
</tr>
<tr>
<td><p>π</p></td>
<td><p><link xref="trigonometry">Pi</link></p></td>
</tr>
<tr>
<td><p>rand</p></td>
<td><p>Random value in the range [0,1] (changes on each read)</p></td>
</tr>
</table>
</page>
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