1<?xml version="1.0" encoding="utf-8"?>
2<page xmlns="http://projectmallard.org/1.0/" type="guide" id="variable" xml:lang="nn">
3
4    <info>
5        <link type="guide" xref="index#equation"/>
6    </info>
7
8	<title>Variables</title>
9
10    <p>
11    To assign a value to a variable use the = symbol or choose the variable to assign to with the <gui>x</gui> button in <link xref="mouse">advanced mode</link>.
12    A variable name must only contain upper or lower characters.
13    </p>
14    <example>
15    <p>
16    x=5
17    </p>
18    <p>
19    value=82
20    </p>
21    </example>
22    <p>
23    Variables can be used in any equation and are substituted for their assigned value.
24    Variables can be inserted using the <gui>x</gui> button.
25    </p>
26    <example>
27    <p>
28    6x+3
29    </p>
30    <p>
31    xy−3x+7y−21
32    </p>
33    </example>
34    <p>
35    The following variables are always defined.
36    </p>
37    <table>
38    <tr>
39    <td><p>ans</p></td>
40    <td><p>Result of previous calculation</p></td>
41    </tr>
42    <tr>
43    <td><p>e</p></td>
44    <td><p><link xref="logarithm">Euler's Number</link></p></td>
45    </tr>
46    <tr>
47    <td><p>π</p></td>
48    <td><p><link xref="trigonometry">Pi</link></p></td>
49    </tr>
50    <tr>
51    <td><p>rand</p></td>
52    <td><p>Random value in the range [0,1] (changes on each read)</p></td>
53    </tr>
54    </table>
55</page>
56