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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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<title>units — Matplotlib 2.2.3 documentation</title>

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<div id="unreleased-message"> You are reading an old version of the documentation (v2.2.3). For the latest version see <a href="https://matplotlib.org/stable/api/units_api.html">https://matplotlib.org/stable/api/units_api.html</a></div>

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<h3><a href="../contents.html">Table Of Contents</a></h3>

<ul>

<li><a class="reference internal" href="#">units</a><ul>

<li><a class="reference internal" href="#module-matplotlib.units"><code class="docutils literal notranslate">matplotlib.units</code></a></li>

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<h1>units<a class="headerlink" href="#units" title="Permalink to this headline">¶</a></h1>

<h2><a class="reference internal" href="#module-matplotlib.units" title="matplotlib.units"><code class="xref py py-mod docutils literal notranslate">matplotlib.units</code></a><a class="headerlink" href="#module-matplotlib.units" title="Permalink to this headline">¶</a></h2>

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">ConversionInterface</code></a>. For example,

here is a complete implementation which supports plotting with native

datetime objects:

<div class="highlight-default notranslate"><div class="highlight"><pre>import matplotlib.units as units

import matplotlib.dates as dates

import matplotlib.ticker as ticker

import datetime

class DateConverter(units.ConversionInterface):

@staticmethod

def convert(value, unit, axis):

'Convert a datetime value to a scalar or array'

return dates.date2num(value)

@staticmethod

def axisinfo(unit, axis):

'Return major and minor tick locators and formatters'

if unit!='date': return None

majloc = dates.AutoDateLocator()

majfmt = dates.AutoDateFormatter(majloc)

return AxisInfo(majloc=majloc,

majfmt=majfmt,

label='date')

@staticmethod

def default_units(x, axis):

'Return the default unit for x or None'

return 'date'

# Finally we register our object type with the Matplotlib units registry.

units.registry[datetime.date] = DateConverter()

</pre></div>

</div>

class <code class="descclassname">matplotlib.units.</code><code class="descname">AxisInfo</code>(majloc=None, minloc=None, majfmt=None, minfmt=None, label=None, default_limits=None)<a class="reference internal" href="../_modules/matplotlib/units.html#AxisInfo">[source]</a><a class="headerlink" href="#matplotlib.units.AxisInfo" title="Permalink to this definition">¶</a></dt>

<dd>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.7)"><code class="xref py py-class docutils literal notranslate">object</code></a>

Information to support default axis labeling, tick labeling, and

default limits. 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-meth docutils literal notranslate">ConversionInterface.axisinfo()</code></a>.

<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">

<dt>majloc, minloc : Locator, optional</dt>

<dd>Tick locators for the major and minor ticks.

</dd>

<dt>majfmt, minfmt : Formatter, optional</dt>

<dd>Tick formatters for the major and minor ticks.

</dd>

<dt>label : str, optional</dt>

<dd>The default axis label.

</dd>

<dt>default_limits : optional</dt>

<dd>The default min and max limits of the axis if no data has

been plotted.

</dd>

</dl>

</td>

</tr>

</tbody>

</table>

Notes

If any of the above are <code class="docutils literal notranslate">None</code>, the axis will simply use the

default value.

</dd></dl>

class <code class="descclassname">matplotlib.units.</code><code class="descname">ConversionInterface</code><a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface">[source]</a><a class="headerlink" href="#matplotlib.units.ConversionInterface" title="Permalink to this definition">¶</a></dt>

The minimal interface for a converter to take custom data types (or

sequences) and convert them to values Matplotlib can use.

static <code class="descname">axisinfo</code>(unit, axis)<a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface.axisinfo">[source]</a><a class="headerlink" href="#matplotlib.units.ConversionInterface.axisinfo" title="Permalink to this definition">¶</a></dt>

<dd>Return an <code class="xref py py-obj docutils literal notranslate">AxisInfo</code> instance for the axis with the

specified units.

</dd></dl>

static <code class="descname">convert</code>(obj, unit, axis)<a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface.convert">[source]</a><a class="headerlink" href="#matplotlib.units.ConversionInterface.convert" title="Permalink to this definition">¶</a></dt>

<dd>Convert obj using unit for the specified axis.

If obj is a sequence, return the converted sequence.

The output must be a sequence of scalars that can be used by the numpy

array layer.

</dd></dl>

static <code class="descname">default_units</code>(x, axis)<a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface.default_units">[source]</a><a class="headerlink" href="#matplotlib.units.ConversionInterface.default_units" title="Permalink to this definition">¶</a></dt>

<dd>Return the default unit for x or <code class="docutils literal notranslate">None</code> for the given axis.

</dd></dl>

static <code class="descname">is_numlike</code>(x)<a class="reference internal" href="../_modules/matplotlib/units.html#ConversionInterface.is_numlike">[source]</a><a class="headerlink" href="#matplotlib.units.ConversionInterface.is_numlike" title="Permalink to this definition">¶</a></dt>

<dd>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.

</dd></dl>

class <code class="descclassname">matplotlib.units.</code><code class="descname">Registry</code><a class="reference internal" href="../_modules/matplotlib/units.html#Registry">[source]</a><a class="headerlink" href="#matplotlib.units.Registry" title="Permalink to this definition">¶</a></dt>

<dd>Bases: <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#dict" title="(in Python v3.7)"><code class="xref py py-class docutils literal notranslate">dict</code></a>

A register that maps types to conversion interfaces.

<code class="descname">get_converter</code>(x)<a class="reference internal" href="../_modules/matplotlib/units.html#Registry.get_converter">[source]</a><a class="headerlink" href="#matplotlib.units.Registry.get_converter" title="Permalink to this definition">¶</a></dt>

<dd>Get the converter for data that has the same type as x. If no

converters are registered for x, returns <code class="docutils literal notranslate">None</code>.

</dd></dl>

</div>

</div>

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