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<page xmlns="http://projectmallard.org/1.0/"
type="topic"
id="plugin-calculator">
<info>
<link type="guide" xref="index#plugins"/>
<desc>Using the calculator plugin.</desc>
</info>
<title><app>Calculator</app></title>
<section>
<title>Calculator Plugin</title>
<p>
The calculator plugin lets you calculate expressions quickly. It can evaluate
expressions entered as text starting with "=". Entering = from command mode will
start text mode directly with = prefixed for quick access.
</p>
</section>
<section>
<title>Basic Usage</title>
<steps>
<item><p>
Activate Kupfer and type <key>=</key>
</p></item>
<item><p>Type in a mathematical expression using
<key>+</key>,<key>-</key>,<key>/</key>,<key>*</key> (and
<key>**</key> for exponentiation)
</p></item>
<item><p>
Press <key>Return</key> to get the result.
</p></item>
</steps>
</section>
<section>
<title>Notes</title>
<p>
The Calculator uses python's math and complex math modules,
and parses expressions as Python expressions. You may use common
mathematical functions, such as <cmd>sqrt</cmd>, <cmd>sin</cmd>,
<cmd>exp</cmd> and <cmd>log</cmd>; the command <cmd>=help</cmd> will
show a list of all defined functions and constants.
</p>
<list>
<item>
<p>
Notice that the power operator in Python is double stars, for example
<code>=3**3</code> will evaluate to 27.
</p>
</item>
<item>
<p>
To calculate trig functions for angles, convert to radians first:
</p>
<code>sin(radians(30)) -> 0.5</code>
</item>
<item>
<p>
The last result is stored as the name _ (an underscore, just like in
the Python console).
</p>
</item>
</list>
</section>
</page>
|
