<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" type="guide" id="variable" xml:lang="it">
<info>
<link type="guide" xref="index#equation"/>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Paolo Stivanin</mal:name>
<mal:email>paolostivanin@yahoo.it</mal:email>
<mal:years>2010</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Luca Ferretti</mal:name>
<mal:email>lferrett@gnome.org</mal:email>
<mal:years>2012</mal:years>
</mal:credit>
</info>
<title>Variabili</title>
<p>
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>.
A variable name must only contain upper or lower case characters.
</p>
<example>
<p>x=5</p>
<p>value=82</p>
</example>
<p>È possibile usare le variabili in ogni equazione, ad esse verrà sostituito il valore assegnato. È possibile inserire le variabili usando il pulsante <gui>x</gui>.</p>
<example>
<p>6x+3</p>
<p>xy−3x+7y−21</p>
</example>
<p>Le seguenti variabili sono sempre definite.</p>
<table>
<tr>
<td><p>_</p></td>
<td><p>Risultato del calcolo precedente</p></td>
</tr>
<tr>
<td><p>e</p></td>
<td><p><link xref="logarithm">Numero di Eulero</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>Valore casuale nell'intervallo [0,1] (cambia ad ogni lettura)</p></td>
</tr>
</table>
</page>