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<div><h1 id="a0000000021">4.1 Variables</h1>
<p>Variables can be assigned to hold numerical values using syntax of the form </p><pre> a = 5.2 * sqrt(64) </pre><p>which may optionally be written as<a name="a0000000404" id="a0000000404"></a> </p><pre> let a = 5.2 * sqrt(64) </pre><p>Numerical variables can subsequently be used by name in mathematical expressions, as in the example: </p><pre> print a / sqrt(64) </pre><p>Having been defined, variables can later be undefined – set to have no value – using syntax of the form: </p><pre> a = </pre><p>A list of all of the variables which are currently defined can be obtained by typing <tt class="tt">show variables</tt><a name="a0000000405" id="a0000000405"></a>. By default, an extensive list is returned, as many physical constants are pre-defined by PyXPlot. In Section <a href="sec-stringvars.html">6.1</a>, we will see that variables can also be set to hold string values – i.e. to hold pieces of text – and that such variables can have great power in allowing the user to auto-generate titles and labels for graphs. </p></div>
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