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<div class="section" id="module-matplotlib.units">
<span id="matplotlib-units"></span><h1><code class="docutils literal notranslate"><span class="pre">matplotlib.units</span></code><a class="headerlink" href="#module-matplotlib.units" title="Permalink to this headline">¶</a></h1>
<p>The classes here provide support for using custom classes with
Matplotlib, e.g., those that do not expose the array interface but know
how to convert themselves to arrays. It also supports classes with
units and units conversion. Use cases include converters for custom
objects, e.g., 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 the register with the Registry
converter dictionary and a <a class="reference internal" href="#matplotlib.units.ConversionInterface" title="matplotlib.units.ConversionInterface"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ConversionInterface</span></code></a>. For example,
here is a complete implementation which supports plotting with native
datetime objects:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">matplotlib.units</span> <span class="k">as</span> <span class="nn">units</span>
<span class="kn">import</span> <span class="nn">matplotlib.dates</span> <span class="k">as</span> <span class="nn">dates</span>
<span class="kn">import</span> <span class="nn">matplotlib.ticker</span> <span class="k">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="s1">'Convert a datetime 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="s1">'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="s1">'date'</span><span class="p">:</span> <span class="k">return</span> <span class="kc">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="s1">'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="s1">'Return the default unit for x or None'</span>
<span class="k">return</span> <span class="s1">'date'</span>
<span class="c1"># Finally we register our object type with the Matplotlib units registry.</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><code class="descclassname">matplotlib.units.</code><code class="descname">AxisInfo</code><span class="sig-paren">(</span><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><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/units.html#AxisInfo"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.units.AxisInfo" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>Information to support default axis labeling, tick labeling, and limits.</p>
<p>An instance of this class must be returned by
<a class="reference internal" href="#matplotlib.units.ConversionInterface.axisinfo" title="matplotlib.units.ConversionInterface.axisinfo"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ConversionInterface.axisinfo</span></code></a>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>majloc, minloc</strong> <span class="classifier-delimiter">:</span> <span class="classifier">Locator, optional</span></dt>
<dd><p class="first last">Tick locators for the major and minor ticks.</p>
</dd>
<dt><strong>majfmt, minfmt</strong> <span class="classifier-delimiter">:</span> <span class="classifier">Formatter, optional</span></dt>
<dd><p class="first last">Tick formatters for the major and minor ticks.</p>
</dd>
<dt><strong>label</strong> <span class="classifier-delimiter">:</span> <span class="classifier">str, optional</span></dt>
<dd><p class="first last">The default axis label.</p>
</dd>
<dt><strong>default_limits</strong> <span class="classifier-delimiter">:</span> <span class="classifier">optional</span></dt>
<dd><p class="first last">The default min and max limits of the axis if no data has
been plotted.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<p class="rubric">Notes</p>
<p>If any of the above are <code class="docutils literal notranslate"><span class="pre">None</span></code>, the axis will simply use the
default value.</p>
</dd></dl>
<dl class="exception">
<dt id="matplotlib.units.ConversionError">
<em class="property">exception </em><code class="descclassname">matplotlib.units.</code><code class="descname">ConversionError</code><a class="reference internal" href="../_modules/matplotlib/units.html#ConversionError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.units.ConversionError" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/exceptions.html#TypeError" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">TypeError</span></code></a></p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.units.ConversionInterface">
<em class="property">class </em><code class="descclassname">matplotlib.units.</code><code class="descname">ConversionInterface</code><a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.units.ConversionInterface" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>The minimal interface for a converter to take custom data types (or
sequences) and convert them to values Matplotlib can use.</p>
<dl class="staticmethod">
<dt id="matplotlib.units.ConversionInterface.axisinfo">
<em class="property">static </em><code class="descname">axisinfo</code><span class="sig-paren">(</span><em>unit</em>, <em>axis</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface.axisinfo"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.units.ConversionInterface.axisinfo" title="Permalink to this definition">¶</a></dt>
<dd><p>Return an <code class="xref py py-obj docutils literal notranslate"><span class="pre">AxisInfo</span></code> for the axis with the specified units.</p>
</dd></dl>
<dl class="staticmethod">
<dt id="matplotlib.units.ConversionInterface.convert">
<em class="property">static </em><code class="descname">convert</code><span class="sig-paren">(</span><em>obj</em>, <em>unit</em>, <em>axis</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface.convert"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.units.ConversionInterface.convert" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert <em>obj</em> using <em>unit</em> for the specified <em>axis</em>.</p>
<p>If <em>obj</em> is a sequence, return the converted sequence. The output 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><code class="descname">default_units</code><span class="sig-paren">(</span><em>x</em>, <em>axis</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface.default_units"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.units.ConversionInterface.default_units" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the default unit for <em>x</em> or <code class="docutils literal notranslate"><span class="pre">None</span></code> for the given axis.</p>
</dd></dl>
<dl class="staticmethod">
<dt id="matplotlib.units.ConversionInterface.is_numlike">
<em class="property">static </em><code class="descname">is_numlike</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface.is_numlike"><span class="viewcode-link">[source]</span></a><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.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.units.Registry">
<em class="property">class </em><code class="descclassname">matplotlib.units.</code><code class="descname">Registry</code><a class="reference internal" href="../_modules/matplotlib/units.html#Registry"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.units.Registry" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#dict" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">dict</span></code></a></p>
<p>Register types with conversion interface.</p>
<dl class="method">
<dt id="matplotlib.units.Registry.get_converter">
<code class="descname">get_converter</code><span class="sig-paren">(</span><em>self</em>, <em>x</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/units.html#Registry.get_converter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.units.Registry.get_converter" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the converter interface instance for <em>x</em>, or None.</p>
</dd></dl>
</dd></dl>
</div>
</div>
</div>
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