<!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>api example code: date_demo.py — Matplotlib 1.2.0 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: '1.2.0', 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 1.2.0 documentation" href="../../_static/opensearch.xml"/> <link rel="top" title="Matplotlib 1.2.0 documentation" href="../../index.html" /> </head> <body> <!-- Piwik --> <script type="text/javascript"> if ("matplotlib.sourceforge.net" == document.location.hostname || "matplotlib.sf.net" == document.location.hostname) { var pkBaseURL = (("https:" == document.location.protocol) ? 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See major_minor_demo1.py for more information on</span> <span class="sd">controlling major and minor ticks</span> <span class="sd">All matplotlib date plotting is done by converting date instances into</span> <span class="sd">days since the 0001-01-01 UTC. The conversion, tick locating and</span> <span class="sd">formatting is done behind the scenes so this is most transparent to</span> <span class="sd">you. The dates module provides several converter functions date2num</span> <span class="sd">and num2date</span> <span class="sd">"""</span> <span class="kn">import</span> <span class="nn">datetime</span> <span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span> <span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span> <span class="kn">import</span> <span class="nn">matplotlib.dates</span> <span class="kn">as</span> <span class="nn">mdates</span> <span class="kn">import</span> <span class="nn">matplotlib.cbook</span> <span class="kn">as</span> <span class="nn">cbook</span> <span class="n">years</span> <span class="o">=</span> <span class="n">mdates</span><span class="o">.</span><span class="n">YearLocator</span><span class="p">()</span> <span class="c"># every year</span> <span class="n">months</span> <span class="o">=</span> <span class="n">mdates</span><span class="o">.</span><span class="n">MonthLocator</span><span class="p">()</span> <span class="c"># every month</span> <span class="n">yearsFmt</span> <span class="o">=</span> <span class="n">mdates</span><span class="o">.</span><span class="n">DateFormatter</span><span class="p">(</span><span class="s">'%Y'</span><span class="p">)</span> <span class="c"># load a numpy record array from yahoo csv data with fields date,</span> <span class="c"># open, close, volume, adj_close from the mpl-data/example directory.</span> <span class="c"># The record array stores python datetime.date as an object array in</span> <span class="c"># the date column</span> <span class="n">datafile</span> <span class="o">=</span> <span class="n">cbook</span><span class="o">.</span><span class="n">get_sample_data</span><span class="p">(</span><span class="s">'goog.npy'</span><span class="p">)</span> <span class="n">r</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">datafile</span><span class="p">)</span><span class="o">.</span><span class="n">view</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">recarray</span><span class="p">)</span> <span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">111</span><span class="p">)</span> <span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">r</span><span class="o">.</span><span class="n">date</span><span class="p">,</span> <span class="n">r</span><span class="o">.</span><span class="n">adj_close</span><span class="p">)</span> <span class="c"># format the ticks</span> <span class="n">ax</span><span class="o">.</span><span class="n">xaxis</span><span class="o">.</span><span class="n">set_major_locator</span><span class="p">(</span><span class="n">years</span><span class="p">)</span> <span class="n">ax</span><span class="o">.</span><span class="n">xaxis</span><span class="o">.</span><span class="n">set_major_formatter</span><span class="p">(</span><span class="n">yearsFmt</span><span class="p">)</span> <span class="n">ax</span><span class="o">.</span><span class="n">xaxis</span><span class="o">.</span><span class="n">set_minor_locator</span><span class="p">(</span><span class="n">months</span><span class="p">)</span> <span class="n">datemin</span> <span class="o">=</span> <span class="n">datetime</span><span class="o">.</span><span class="n">date</span><span class="p">(</span><span class="n">r</span><span class="o">.</span><span class="n">date</span><span class="o">.</span><span class="n">min</span><span class="p">()</span><span class="o">.</span><span class="n">year</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span> <span class="n">datemax</span> <span class="o">=</span> <span class="n">datetime</span><span class="o">.</span><span class="n">date</span><span class="p">(</span><span class="n">r</span><span class="o">.</span><span class="n">date</span><span class="o">.</span><span class="n">max</span><span class="p">()</span><span class="o">.</span><span class="n">year</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span> <span class="n">ax</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span><span class="n">datemin</span><span class="p">,</span> <span class="n">datemax</span><span class="p">)</span> <span class="c"># format the coords message box</span> <span class="k">def</span> <span class="nf">price</span><span class="p">(</span><span class="n">x</span><span class="p">):</span> <span class="k">return</span> <span class="s">'$</span><span class="si">%1.2f</span><span class="s">'</span><span class="o">%</span><span class="n">x</span> <span class="n">ax</span><span class="o">.</span><span class="n">format_xdata</span> <span class="o">=</span> <span class="n">mdates</span><span class="o">.</span><span class="n">DateFormatter</span><span class="p">(</span><span class="s">'%Y-%m-</span><span class="si">%d</span><span class="s">'</span><span class="p">)</span> <span class="n">ax</span><span class="o">.</span><span class="n">format_ydata</span> <span class="o">=</span> <span class="n">price</span> <span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="bp">True</span><span class="p">)</span> <span class="c"># rotates and right aligns the x labels, and moves the bottom of the</span> <span class="c"># axes up to make room for them</span> <span class="n">fig</span><span class="o">.</span><span class="n">autofmt_xdate</span><span class="p">()</span> <span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span> </pre></div> </div> <p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><em>Search examples</em></a>)</p> </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><a href="../../index.html">home</a>| </li> <li><a href="../../search.html">search</a>| </li> <li><a href="../index.html">examples</a>| </li> <li><a href="../../gallery.html">gallery</a>| </li> <li><a href="../../contents.html">docs</a> 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