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<div class="section" id="module-matplotlib.category">
<span id="matplotlib-category"></span><h1><code class="docutils literal notranslate"><span class="pre">matplotlib.category</span></code><a class="headerlink" href="#module-matplotlib.category" title="Permalink to this headline">¶</a></h1>
<p>Plotting of string "category" data: <code class="docutils literal notranslate"><span class="pre">plot(['d',</span> <span class="pre">'f',</span> <span class="pre">'a'],</span> <span class="pre">[1,</span> <span class="pre">2,</span> <span class="pre">3])</span></code> will
plot three points with x-axis values of 'd', 'f', 'a'.</p>
<p>See <a class="reference internal" href="../gallery/lines_bars_and_markers/categorical_variables.html"><span class="doc">Plotting categorical variables</span></a> for an
example.</p>
<p>The module uses Matplotlib's <a class="reference internal" href="units_api.html#module-matplotlib.units" title="matplotlib.units"><code class="xref py py-obj docutils literal notranslate"><span class="pre">matplotlib.units</span></code></a> mechanism to convert from
strings to integers and provides a tick locator, a tick formatter, and the
<a class="reference internal" href="#matplotlib.category.UnitData" title="matplotlib.category.UnitData"><code class="xref py py-obj docutils literal notranslate"><span class="pre">UnitData</span></code></a> class that creates and stores the string-to-integer mapping.</p>
<dl class="py class">
<dt id="matplotlib.category.StrCategoryConverter">
<em class="property">class </em><code class="descclassname">matplotlib.category.</code><code class="descname">StrCategoryConverter</code><a class="reference internal" href="../_modules/matplotlib/category.html#StrCategoryConverter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.StrCategoryConverter" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="units_api.html#matplotlib.units.ConversionInterface" title="matplotlib.units.ConversionInterface"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.units.ConversionInterface</span></code></a></p>
<dl class="py method">
<dt id="matplotlib.category.StrCategoryConverter.axisinfo">
<em class="property">static </em><code class="descname">axisinfo</code><span class="sig-paren">(</span><em><span class="n">unit</span></em>, <em><span class="n">axis</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#StrCategoryConverter.axisinfo"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.StrCategoryConverter.axisinfo" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the default axis ticks and labels.</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 docutils">
<dt><strong>unit</strong><span class="classifier"><a class="reference internal" href="#matplotlib.category.UnitData" title="matplotlib.category.UnitData"><code class="xref py py-obj docutils literal notranslate"><span class="pre">UnitData</span></code></a></span></dt><dd><p>object string unit information for value</p>
</dd>
<dt><strong>axis</strong><span class="classifier"><a class="reference internal" href="axis_api.html#matplotlib.axis.Axis" title="matplotlib.axis.Axis"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Axis</span></code></a></span></dt><dd><p>axis for which information is being set</p>
</dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">
<dt><a class="reference internal" href="units_api.html#matplotlib.units.AxisInfo" title="matplotlib.units.AxisInfo"><code class="xref py py-obj docutils literal notranslate"><span class="pre">AxisInfo</span></code></a></dt><dd><p>Information to support default tick labeling</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="py method">
<dt id="matplotlib.category.StrCategoryConverter.convert">
<em class="property">static </em><code class="descname">convert</code><span class="sig-paren">(</span><em><span class="n">value</span></em>, <em><span class="n">unit</span></em>, <em><span class="n">axis</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#StrCategoryConverter.convert"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.StrCategoryConverter.convert" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert strings in <em>value</em> to floats using mapping information stored
in the <em>unit</em> object.</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 docutils">
<dt><strong>value</strong><span class="classifier">str or iterable</span></dt><dd><p>Value or list of values to be converted.</p>
</dd>
<dt><strong>unit</strong><span class="classifier"><a class="reference internal" href="#matplotlib.category.UnitData" title="matplotlib.category.UnitData"><code class="xref py py-obj docutils literal notranslate"><span class="pre">UnitData</span></code></a></span></dt><dd><p>An object mapping strings to integers.</p>
</dd>
<dt><strong>axis</strong><span class="classifier"><a class="reference internal" href="axis_api.html#matplotlib.axis.Axis" title="matplotlib.axis.Axis"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Axis</span></code></a></span></dt><dd><p>The axis on which the converted value is plotted.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><em>axis</em> is unused.</p>
</div>
</dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">
<dt>float or ndarray[float]</dt><dd></dd>
</dl>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="py method">
<dt id="matplotlib.category.StrCategoryConverter.default_units">
<em class="property">static </em><code class="descname">default_units</code><span class="sig-paren">(</span><em><span class="n">data</span></em>, <em><span class="n">axis</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#StrCategoryConverter.default_units"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.StrCategoryConverter.default_units" title="Permalink to this definition">¶</a></dt>
<dd><p>Set and update the <a class="reference internal" href="axis_api.html#matplotlib.axis.Axis" title="matplotlib.axis.Axis"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Axis</span></code></a> units.</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 docutils">
<dt><strong>data</strong><span class="classifier">str or iterable of str</span></dt><dd></dd>
<dt><strong>axis</strong><span class="classifier"><a class="reference internal" href="axis_api.html#matplotlib.axis.Axis" title="matplotlib.axis.Axis"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Axis</span></code></a></span></dt><dd><p>axis on which the data is plotted</p>
</dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">
<dt><a class="reference internal" href="#matplotlib.category.UnitData" title="matplotlib.category.UnitData"><code class="xref py py-obj docutils literal notranslate"><span class="pre">UnitData</span></code></a></dt><dd><p>object storing string to integer mapping</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
</dd></dl>
</dd></dl>
<dl class="py class">
<dt id="matplotlib.category.StrCategoryFormatter">
<em class="property">class </em><code class="descclassname">matplotlib.category.</code><code class="descname">StrCategoryFormatter</code><span class="sig-paren">(</span><em><span class="n">units_mapping</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#StrCategoryFormatter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.StrCategoryFormatter" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="ticker_api.html#matplotlib.ticker.Formatter" title="matplotlib.ticker.Formatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.ticker.Formatter</span></code></a></p>
<p>String representation of the data at every tick.</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>units_mapping</strong><span class="classifier">dict</span></dt><dd><p>Mapping of category names (str) to indices (int).</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<dl class="py method">
<dt id="matplotlib.category.StrCategoryFormatter.format_ticks">
<code class="descname">format_ticks</code><span class="sig-paren">(</span><em><span class="n">self</span></em>, <em><span class="n">values</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#StrCategoryFormatter.format_ticks"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.StrCategoryFormatter.format_ticks" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the tick labels for all the ticks at once.</p>
</dd></dl>
</dd></dl>
<dl class="py class">
<dt id="matplotlib.category.StrCategoryLocator">
<em class="property">class </em><code class="descclassname">matplotlib.category.</code><code class="descname">StrCategoryLocator</code><span class="sig-paren">(</span><em><span class="n">units_mapping</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#StrCategoryLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.StrCategoryLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="ticker_api.html#matplotlib.ticker.Locator" title="matplotlib.ticker.Locator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.ticker.Locator</span></code></a></p>
<p>Tick at every integer mapping of the string data.</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>units_mapping</strong><span class="classifier">dict</span></dt><dd><p>Mapping of category names (str) to indices (int).</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<dl class="py method">
<dt id="matplotlib.category.StrCategoryLocator.tick_values">
<code class="descname">tick_values</code><span class="sig-paren">(</span><em><span class="n">self</span></em>, <em><span class="n">vmin</span></em>, <em><span class="n">vmax</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#StrCategoryLocator.tick_values"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.StrCategoryLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the values of the located ticks given <strong>vmin</strong> and <strong>vmax</strong>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>To get tick locations with the vmin and vmax values defined
automatically for the associated <code class="xref py py-attr docutils literal notranslate"><span class="pre">axis</span></code> simply call
the Locator instance:</p>
<div class="last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">loc</span><span class="p">))</span>
<span class="go"><type 'Locator'></span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="n">loc</span><span class="p">())</span>
<span class="go">[1, 2, 3, 4]</span>
</pre></div>
</div>
</div>
</dd></dl>
</dd></dl>
<dl class="py class">
<dt id="matplotlib.category.UnitData">
<em class="property">class </em><code class="descclassname">matplotlib.category.</code><code class="descname">UnitData</code><span class="sig-paren">(</span><em><span class="n">data</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#UnitData"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.UnitData" 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 v3.9)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>Create mapping between unique categorical values and integer ids.</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>data</strong><span class="classifier">iterable</span></dt><dd><p>sequence of string values</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<dl class="py method">
<dt id="matplotlib.category.UnitData.update">
<code class="descname">update</code><span class="sig-paren">(</span><em><span class="n">self</span></em>, <em><span class="n">data</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/category.html#UnitData.update"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.category.UnitData.update" title="Permalink to this definition">¶</a></dt>
<dd><p>Map new values to integer identifiers.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
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<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">
<dt><strong>data</strong><span class="classifier">iterable of str or bytes</span></dt><dd></dd>
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<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><dl class="first last docutils">
<dt>TypeError</dt><dd><p>If elements in <em>data</em> are neither str nor bytes.</p>
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