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<div><h1 id="a0000000024">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 in longhand as<a name="a0000000439" id="a0000000439"></a> </p><pre> let a = 5.2 * sqrt(64) </pre><p>Variables can subsequently be used by name in mathematical expressions, for 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>Variables can also hold non-numeric data, such as strings, colors, dates, lists and dictionaries. The syntax for defining many of these data structures is similar to that used by python, for example: </p><pre>
myList = [8,2,1,7]
myDict = {'john':27 , 'fred':14 , 'lisa':myList}
myDate = time.fromCalendar(2012,7,1,14,30,0)
</pre><p>More information about Pyxplot’s data types can be found in Chapter <a href="chap-progDataTypes.html">6</a>. </p><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="a0000000440" id="a0000000440"></a>. Some constants are pre-defined by Pyxplot, and so a number of variables are listed even if none have been set by the user. </p></div>
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