<!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>pylab_examples example code: scatter_hist.py — Matplotlib v1.1.1 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: '1.1.1', 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 v1.1.1 documentation" href="../../_static/opensearch.xml"/> <link rel="top" title="Matplotlib v1.1.1 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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<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="pylab-examples-example-code-scatter-hist-py"> <span id="pylab-examples-scatter-hist"></span><h1>pylab_examples example code: scatter_hist.py<a class="headerlink" href="#pylab-examples-example-code-scatter-hist-py" title="Permalink to this headline">ΒΆ</a></h1> <p>(<a class="reference external" href="../../mpl_examples/pylab_examples/scatter_hist.py">Source code</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/scatter_hist.png">png</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/scatter_hist.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/scatter_hist.pdf">pdf</a>)</p> <div class="figure"> <img alt="../../_images/scatter_hist1.png" src="../../_images/scatter_hist1.png" /> </div> <div class="highlight-python"><div class="highlight"><pre><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">from</span> <span class="nn">matplotlib.ticker</span> <span class="kn">import</span> <span class="n">NullFormatter</span> <span class="c"># the random data</span> <span class="n">x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span> <span class="n">y</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span> <span class="n">nullfmt</span> <span class="o">=</span> <span class="n">NullFormatter</span><span class="p">()</span> <span class="c"># no labels</span> <span class="c"># definitions for the axes</span> <span class="n">left</span><span class="p">,</span> <span class="n">width</span> <span class="o">=</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.65</span> <span class="n">bottom</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.65</span> <span class="n">bottom_h</span> <span class="o">=</span> <span class="n">left_h</span> <span class="o">=</span> <span class="n">left</span><span class="o">+</span><span class="n">width</span><span class="o">+</span><span class="mf">0.02</span> <span class="n">rect_scatter</span> <span class="o">=</span> <span class="p">[</span><span class="n">left</span><span class="p">,</span> <span class="n">bottom</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="n">height</span><span class="p">]</span> <span class="n">rect_histx</span> <span class="o">=</span> <span class="p">[</span><span class="n">left</span><span class="p">,</span> <span class="n">bottom_h</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="mf">0.2</span><span class="p">]</span> <span class="n">rect_histy</span> <span class="o">=</span> <span class="p">[</span><span class="n">left_h</span><span class="p">,</span> <span class="n">bottom</span><span class="p">,</span> <span class="mf">0.2</span><span class="p">,</span> <span class="n">height</span><span class="p">]</span> <span class="c"># start with a rectangular Figure</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">8</span><span class="p">,</span><span class="mi">8</span><span class="p">))</span> <span class="n">axScatter</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">axes</span><span class="p">(</span><span class="n">rect_scatter</span><span class="p">)</span> <span class="n">axHistx</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">axes</span><span class="p">(</span><span class="n">rect_histx</span><span class="p">)</span> <span class="n">axHisty</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">axes</span><span class="p">(</span><span class="n">rect_histy</span><span class="p">)</span> <span class="c"># no labels</span> <span class="n">axHistx</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">nullfmt</span><span class="p">)</span> <span class="n">axHisty</span><span class="o">.</span><span class="n">yaxis</span><span class="o">.</span><span class="n">set_major_formatter</span><span class="p">(</span><span class="n">nullfmt</span><span class="p">)</span> <span class="c"># the scatter plot:</span> <span class="n">axScatter</span><span class="o">.</span><span class="n">scatter</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span> <span class="c"># now determine nice limits by hand:</span> <span class="n">binwidth</span> <span class="o">=</span> <span class="mf">0.25</span> <span class="n">xymax</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">max</span><span class="p">(</span> <span class="p">[</span><span class="n">np</span><span class="o">.</span><span class="n">max</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">fabs</span><span class="p">(</span><span class="n">x</span><span class="p">)),</span> <span class="n">np</span><span class="o">.</span><span class="n">max</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">fabs</span><span class="p">(</span><span class="n">y</span><span class="p">))]</span> <span class="p">)</span> <span class="n">lim</span> <span class="o">=</span> <span class="p">(</span> <span class="nb">int</span><span class="p">(</span><span class="n">xymax</span><span class="o">/</span><span class="n">binwidth</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span> <span class="o">*</span> <span class="n">binwidth</span> <span class="n">axScatter</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span> <span class="p">(</span><span class="o">-</span><span class="n">lim</span><span class="p">,</span> <span class="n">lim</span><span class="p">)</span> <span class="p">)</span> <span class="n">axScatter</span><span class="o">.</span><span class="n">set_ylim</span><span class="p">(</span> <span class="p">(</span><span class="o">-</span><span class="n">lim</span><span class="p">,</span> <span class="n">lim</span><span class="p">)</span> <span class="p">)</span> <span class="n">bins</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="o">-</span><span class="n">lim</span><span class="p">,</span> <span class="n">lim</span> <span class="o">+</span> <span class="n">binwidth</span><span class="p">,</span> <span class="n">binwidth</span><span class="p">)</span> <span class="n">axHistx</span><span class="o">.</span><span class="n">hist</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">bins</span><span class="o">=</span><span class="n">bins</span><span class="p">)</span> <span class="n">axHisty</span><span class="o">.</span><span class="n">hist</span><span class="p">(</span><span class="n">y</span><span class="p">,</span> <span class="n">bins</span><span class="o">=</span><span class="n">bins</span><span class="p">,</span> <span class="n">orientation</span><span class="o">=</span><span class="s">'horizontal'</span><span class="p">)</span> <span class="n">axHistx</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span> <span class="n">axScatter</span><span class="o">.</span><span class="n">get_xlim</span><span class="p">()</span> <span class="p">)</span> <span class="n">axHisty</span><span class="o">.</span><span class="n">set_ylim</span><span class="p">(</span> <span class="n">axScatter</span><span class="o">.</span><span class="n">get_ylim</span><span class="p">()</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> »</li> </ul> </div> <div class="footer"> © Copyright 2008, John Hunter, Darren Dale, 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