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<li><a class="reference internal" href="#">units</a><ul>
<li><a class="reference internal" href="#module-matplotlib.units"><tt class="docutils literal"><span class="pre">matplotlib.units</span></tt></a></li>
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<div class="section" id="units">
<h1>units<a class="headerlink" href="#units" title="Permalink to this headline">¶</a></h1>
<div class="section" id="module-matplotlib.units">
<span id="matplotlib-units"></span><h2><a class="reference internal" href="#module-matplotlib.units" title="matplotlib.units"><tt class="xref py py-mod docutils literal"><span class="pre">matplotlib.units</span></tt></a><a class="headerlink" href="#module-matplotlib.units" title="Permalink to this headline">¶</a></h2>
<p>The classes here provide support for using custom classes with
matplotlib, eg those that do not expose the array interface but know
how to converter themselves to arrays. It also supoprts classes with
units and units conversion. Use cases include converters for custom
objects, eg a list of datetime objects, as well as for objects that
are unit aware. We don’t assume any particular units implementation,
rather a units implementation must provide a ConversionInterface, and
the register with the Registry converter dictionary. For example,
here is a complete implementation which supports plotting with native
datetime objects:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">matplotlib.units</span> <span class="kn">as</span> <span class="nn">units</span>
<span class="kn">import</span> <span class="nn">matplotlib.dates</span> <span class="kn">as</span> <span class="nn">dates</span>
<span class="kn">import</span> <span class="nn">matplotlib.ticker</span> <span class="kn">as</span> <span class="nn">ticker</span>
<span class="kn">import</span> <span class="nn">datetime</span>
<span class="k">class</span> <span class="nc">DateConverter</span><span class="p">(</span><span class="n">units</span><span class="o">.</span><span class="n">ConversionInterface</span><span class="p">):</span>
<span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">convert</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">unit</span><span class="p">,</span> <span class="n">axis</span><span class="p">):</span>
<span class="s">'convert value to a scalar or array'</span>
<span class="k">return</span> <span class="n">dates</span><span class="o">.</span><span class="n">date2num</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">axisinfo</span><span class="p">(</span><span class="n">unit</span><span class="p">,</span> <span class="n">axis</span><span class="p">):</span>
<span class="s">'return major and minor tick locators and formatters'</span>
<span class="k">if</span> <span class="n">unit</span><span class="o">!=</span><span class="s">'date'</span><span class="p">:</span> <span class="k">return</span> <span class="bp">None</span>
<span class="n">majloc</span> <span class="o">=</span> <span class="n">dates</span><span class="o">.</span><span class="n">AutoDateLocator</span><span class="p">()</span>
<span class="n">majfmt</span> <span class="o">=</span> <span class="n">dates</span><span class="o">.</span><span class="n">AutoDateFormatter</span><span class="p">(</span><span class="n">majloc</span><span class="p">)</span>
<span class="k">return</span> <span class="n">AxisInfo</span><span class="p">(</span><span class="n">majloc</span><span class="o">=</span><span class="n">majloc</span><span class="p">,</span>
<span class="n">majfmt</span><span class="o">=</span><span class="n">majfmt</span><span class="p">,</span>
<span class="n">label</span><span class="o">=</span><span class="s">'date'</span><span class="p">)</span>
<span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">default_units</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">axis</span><span class="p">):</span>
<span class="s">'return the default unit for x or None'</span>
<span class="k">return</span> <span class="s">'date'</span>
<span class="c"># finally we register our object type with a converter</span>
<span class="n">units</span><span class="o">.</span><span class="n">registry</span><span class="p">[</span><span class="n">datetime</span><span class="o">.</span><span class="n">date</span><span class="p">]</span> <span class="o">=</span> <span class="n">DateConverter</span><span class="p">()</span>
</pre></div>
</div>
<dl class="class">
<dt id="matplotlib.units.AxisInfo">
<em class="property">class </em><tt class="descclassname">matplotlib.units.</tt><tt class="descname">AxisInfo</tt><big>(</big><em>majloc=None</em>, <em>minloc=None</em>, <em>majfmt=None</em>, <em>minfmt=None</em>, <em>label=None</em>, <em>default_limits=None</em><big>)</big><a class="headerlink" href="#matplotlib.units.AxisInfo" title="Permalink to this definition">¶</a></dt>
<dd><p>information to support default axis labeling and tick labeling, and
default limits</p>
<p>majloc and minloc: TickLocators for the major and minor ticks
majfmt and minfmt: TickFormatters for the major and minor ticks
label: the default axis label
default_limits: the default min, max of the axis if no data is present
If any of the above are None, the axis will simply use the default</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.units.ConversionInterface">
<em class="property">class </em><tt class="descclassname">matplotlib.units.</tt><tt class="descname">ConversionInterface</tt><a class="headerlink" href="#matplotlib.units.ConversionInterface" title="Permalink to this definition">¶</a></dt>
<dd><p>The minimal interface for a converter to take custom instances (or
sequences) and convert them to values mpl can use</p>
<dl class="staticmethod">
<dt id="matplotlib.units.ConversionInterface.axisinfo">
<em class="property">static </em><tt class="descname">axisinfo</tt><big>(</big><em>unit</em>, <em>axis</em><big>)</big><a class="headerlink" href="#matplotlib.units.ConversionInterface.axisinfo" title="Permalink to this definition">¶</a></dt>
<dd><p>return an units.AxisInfo instance for axis with the specified units</p>
</dd></dl>
<dl class="staticmethod">
<dt id="matplotlib.units.ConversionInterface.convert">
<em class="property">static </em><tt class="descname">convert</tt><big>(</big><em>obj</em>, <em>unit</em>, <em>axis</em><big>)</big><a class="headerlink" href="#matplotlib.units.ConversionInterface.convert" title="Permalink to this definition">¶</a></dt>
<dd><p>convert obj using unit for the specified axis. If obj is a sequence,
return the converted sequence. The ouput must be a sequence of scalars
that can be used by the numpy array layer</p>
</dd></dl>
<dl class="staticmethod">
<dt id="matplotlib.units.ConversionInterface.default_units">
<em class="property">static </em><tt class="descname">default_units</tt><big>(</big><em>x</em>, <em>axis</em><big>)</big><a class="headerlink" href="#matplotlib.units.ConversionInterface.default_units" title="Permalink to this definition">¶</a></dt>
<dd><p>return the default unit for x or None for the given axis</p>
</dd></dl>
<dl class="staticmethod">
<dt id="matplotlib.units.ConversionInterface.is_numlike">
<em class="property">static </em><tt class="descname">is_numlike</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#matplotlib.units.ConversionInterface.is_numlike" title="Permalink to this definition">¶</a></dt>
<dd><p>The matplotlib datalim, autoscaling, locators etc work with
scalars which are the units converted to floats given the
current unit. The converter may be passed these floats, or
arrays of them, even when units are set. Derived conversion
interfaces may opt to pass plain-ol unitless numbers through
the conversion interface and this is a helper function for
them.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.units.Registry">
<em class="property">class </em><tt class="descclassname">matplotlib.units.</tt><tt class="descname">Registry</tt><a class="headerlink" href="#matplotlib.units.Registry" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <tt class="xref py py-class docutils literal"><span class="pre">dict</span></tt></p>
<p>register types with conversion interface</p>
<dl class="method">
<dt id="matplotlib.units.Registry.get_converter">
<tt class="descname">get_converter</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#matplotlib.units.Registry.get_converter" title="Permalink to this definition">¶</a></dt>
<dd><p>get the converter interface instance for x, or None</p>
</dd></dl>
</dd></dl>
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© Copyright 2002 - 2012 John Hunter, Darren Dale, Eric Firing, Michael Droettboom and the matplotlib development team; 2012 - 2013 The matplotlib development team.
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