-
Notifications
You must be signed in to change notification settings - Fork 60
Expand file tree
/
Copy pathunits_api.html
More file actions
287 lines (257 loc) · 15.9 KB
/
units_api.html
File metadata and controls
287 lines (257 loc) · 15.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>units — Matplotlib 1.2.1 documentation</title>
<link rel="stylesheet" href="../_static/mpl.css" type="text/css" />
<link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT: '../',
VERSION: '1.2.1',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: true
};
</script>
<script type="text/javascript" src="../_static/jquery.js"></script>
<script type="text/javascript" src="../_static/underscore.js"></script>
<script type="text/javascript" src="../_static/doctools.js"></script>
<link rel="search" type="application/opensearchdescription+xml"
title="Search within Matplotlib 1.2.1 documentation"
href="../_static/opensearch.xml"/>
<link rel="top" title="Matplotlib 1.2.1 documentation" href="../index.html" />
<link rel="up" title="The Matplotlib API" href="index.html" />
<link rel="next" title="widgets" href="widgets_api.html" />
<link rel="prev" title="tight_layout" href="tight_layout_api.html" />
<link rel="canonical" href="https://matplotlib.org/stable/api/units_api.html" />
</head>
<body>
<div id="unreleased-message"> You are reading an old version of the documentation (v1.2.1). 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>
<!-- Piwik -->
<script type="text/javascript">
if ("matplotlib.sourceforge.net" == document.location.hostname ||
"matplotlib.sf.net" == document.location.hostname) {
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/matplotlib/" : "http://apps.sourceforge.net/piwik/matplotlib/");
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
}
</script>
<script type="text/javascript">
if ("matplotlib.sourceforge.net" == document.location.hostname ||
"matplotlib.sf.net" == document.location.hostname) {
piwik_action_name = '';
piwik_idsite = 1;
piwik_url = pkBaseURL + "piwik.php";
piwik_log(piwik_action_name, piwik_idsite, piwik_url);
document.write(unescape('%3Cobject%3E%3Cnoscript%3E%3Cp%3E%3Cimg src="http://apps.sourceforge.net/piwik/matplotlib/piwik.php?idsite=1" alt="piwik"/%3E%3C/p%3E%3C/noscript%3E%3C/object%3E'));
}
</script>
<!-- End Piwik Tag -->
<link rel="shortcut icon" href="_static/favicon.ico">
<!-- The "Fork me on github" ribbon -->
<img style="float: right; margin-bottom: -40px; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_orange_ff7600.png" usemap="#ribbonmap"/>
<map name="ribbonmap">
<area shape="poly" coords="15,0,148,-1,148,135" href="https://github.com/matplotlib/matplotlib" title="Fork me on GitHub" />
</map>
<div style="background-color: white; text-align: left; padding: 10px 10px 15px 15px">
<a href="../index.html"><img src="../_static/logo2.png" border="0" alt="matplotlib"/></a>
</div>
<div class="related">
<h3>Navigation</h3>
<ul>
<li class="right" style="margin-right: 10px">
<a href="../genindex.html" title="General Index"
accesskey="I">index</a></li>
<li class="right" >
<a href="../py-modindex.html" title="Python Module Index"
>modules</a> |</li>
<li class="right" >
<a href="widgets_api.html" title="widgets"
accesskey="N">next</a> |</li>
<li class="right" >
<a href="tight_layout_api.html" title="tight_layout"
accesskey="P">previous</a> |</li>
<li><a href="../index.html">home</a>| </li>
<li><a href="http://www.matplotlib.org/downloads.html">downloads</a>| </li>
<li><a href="../search.html">search</a>| </li>
<li><a href="../examples/index.html">examples</a>| </li>
<li><a href="../gallery.html">gallery</a>| </li>
<li><a href="../citing.html">citation</a>| </li>
<li><a href="../contents.html">docs</a> »</li>
<li><a href="index.html" accesskey="U">The Matplotlib API</a> »</li>
</ul>
</div>
<div class="sphinxsidebar">
<div class="sphinxsidebarwrapper">
<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"><tt class="docutils literal"><span class="pre">matplotlib.units</span></tt></a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="tight_layout_api.html"
title="previous chapter">tight_layout</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="widgets_api.html"
title="next chapter">widgets</a></p>
<h3>This Page</h3>
<ul class="this-page-menu">
<li><a href="../_sources/api/units_api.txt"
rel="nofollow">Show Source</a></li>
</ul>
<div id="searchbox" style="display: none">
<h3>Quick search</h3>
<form class="search" action="../search.html" method="get">
<input type="text" name="q" />
<input type="submit" value="Go" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
<p class="searchtip" style="font-size: 90%">
Enter search terms or a module, class or function name.
</p>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</div>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body">
<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>
</div>
</div>
</div>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="related">
<h3>Navigation</h3>
<ul>
<li class="right" style="margin-right: 10px">
<a href="../genindex.html" title="General Index"
>index</a></li>
<li class="right" >
<a href="../py-modindex.html" title="Python Module Index"
>modules</a> |</li>
<li class="right" >
<a href="widgets_api.html" title="widgets"
>next</a> |</li>
<li class="right" >
<a href="tight_layout_api.html" title="tight_layout"
>previous</a> |</li>
<li><a href="../index.html">home</a>| </li>
<li><a href="http://www.matplotlib.org/downloads.html">downloads</a>| </li>
<li><a href="../search.html">search</a>| </li>
<li><a href="../examples/index.html">examples</a>| </li>
<li><a href="../gallery.html">gallery</a>| </li>
<li><a href="../citing.html">citation</a>| </li>
<li><a href="../contents.html">docs</a> »</li>
<li><a href="index.html" >The Matplotlib API</a> »</li>
</ul>
</div>
<div class="footer">
© Copyright 2013 John Hunter, Darren Dale, Eric Firing, Michael Droettboom and the matplotlib development team.
Last updated on May 29, 2013.
Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2b1.
</div>
</body>
</html>