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<page xmlns="http://projectmallard.org/1.0/" type="guide" id="variable" xml:lang="et">

    <info>
        <link type="guide" xref="index#equation"/>
    
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Ilmar Kerm</mal:name>
      <mal:email>ikerm hot ee</mal:email>
      <mal:years>2001, 2002.</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Tõivo Leedjärv</mal:name>
      <mal:email>toivo linux ee</mal:email>
      <mal:years>2002, 2003.</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Priit Laes</mal:name>
      <mal:email>plaes plaes org</mal:email>
      <mal:years>2004–2006, 2008, 2009</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Ivar Smolin</mal:name>
      <mal:email>okul linux ee</mal:email>
      <mal:years>2005–2010, 2014–2015, 2018.</mal:years>
    </mal:credit>
  </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>x</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>x</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>
