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<div class="section" id="pylab-examples-example-code-contour-label-demo-py">
<span id="pylab-examples-contour-label-demo"></span><h1>pylab_examples example code: contour_label_demo.py<a class="headerlink" href="#pylab-examples-example-code-contour-label-demo-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/pylab_examples/contour_label_demo.py">Source code</a>)</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="sd">"""</span>
<span class="sd">Illustrate some of the more advanced things that one can do with</span>
<span class="sd">contour labels.</span>
<span class="sd">See also contour_demo.py.</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">matplotlib</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.cm</span> <span class="kn">as</span> <span class="nn">cm</span>
<span class="kn">import</span> <span class="nn">matplotlib.mlab</span> <span class="kn">as</span> <span class="nn">mlab</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">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
<span class="n">matplotlib</span><span class="o">.</span><span class="n">rcParams</span><span class="p">[</span><span class="s">'xtick.direction'</span><span class="p">]</span> <span class="o">=</span> <span class="s">'out'</span>
<span class="n">matplotlib</span><span class="o">.</span><span class="n">rcParams</span><span class="p">[</span><span class="s">'ytick.direction'</span><span class="p">]</span> <span class="o">=</span> <span class="s">'out'</span>
<span class="c">##################################################</span>
<span class="c"># Define our surface</span>
<span class="c">##################################################</span>
<span class="n">delta</span> <span class="o">=</span> <span class="mf">0.025</span>
<span class="n">x</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="mf">3.0</span><span class="p">,</span> <span class="mf">3.0</span><span class="p">,</span> <span class="n">delta</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">arange</span><span class="p">(</span><span class="o">-</span><span class="mf">2.0</span><span class="p">,</span> <span class="mf">2.0</span><span class="p">,</span> <span class="n">delta</span><span class="p">)</span>
<span class="n">X</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">meshgrid</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="n">Z1</span> <span class="o">=</span> <span class="n">mlab</span><span class="o">.</span><span class="n">bivariate_normal</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="mf">1.0</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">)</span>
<span class="n">Z2</span> <span class="o">=</span> <span class="n">mlab</span><span class="o">.</span><span class="n">bivariate_normal</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="mf">1.5</span><span class="p">,</span> <span class="mf">0.5</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="c"># difference of Gaussians</span>
<span class="n">Z</span> <span class="o">=</span> <span class="mf">10.0</span> <span class="o">*</span> <span class="p">(</span><span class="n">Z2</span> <span class="o">-</span> <span class="n">Z1</span><span class="p">)</span>
<span class="c">##################################################</span>
<span class="c"># Make contour labels using creative float classes</span>
<span class="c"># Follows suggestion of Manuel Metz</span>
<span class="c">##################################################</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
<span class="c"># Basic contour plot</span>
<span class="n">CS</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">contour</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="n">Z</span><span class="p">)</span>
<span class="c"># Define a class that forces representation of float to look a certain way</span>
<span class="c"># This remove trailing zero so '1.0' becomes '1'</span>
<span class="k">class</span> <span class="nc">nf</span><span class="p">(</span><span class="nb">float</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="nb">str</span> <span class="o">=</span> <span class="s">'</span><span class="si">%.1f</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">__float__</span><span class="p">(),)</span>
<span class="k">if</span> <span class="nb">str</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">==</span><span class="s">'0'</span><span class="p">:</span>
<span class="k">return</span> <span class="s">'</span><span class="si">%.0f</span><span class="s">'</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">__float__</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="s">'</span><span class="si">%.1f</span><span class="s">'</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">__float__</span><span class="p">()</span>
<span class="c"># Recast levels to new class</span>
<span class="n">CS</span><span class="o">.</span><span class="n">levels</span> <span class="o">=</span> <span class="p">[</span><span class="n">nf</span><span class="p">(</span><span class="n">val</span><span class="p">)</span> <span class="k">for</span> <span class="n">val</span> <span class="ow">in</span> <span class="n">CS</span><span class="o">.</span><span class="n">levels</span> <span class="p">]</span>
<span class="c"># Label levels with specially formatted floats</span>
<span class="k">if</span> <span class="n">plt</span><span class="o">.</span><span class="n">rcParams</span><span class="p">[</span><span class="s">"text.usetex"</span><span class="p">]:</span>
<span class="n">fmt</span> <span class="o">=</span> <span class="s">r'</span><span class="si">%r</span><span class="s"> \</span><span class="si">%%</span><span class="s">'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">fmt</span> <span class="o">=</span> <span class="s">'</span><span class="si">%r</span><span class="s"> </span><span class="si">%%</span><span class="s">'</span>
<span class="n">plt</span><span class="o">.</span><span class="n">clabel</span><span class="p">(</span><span class="n">CS</span><span class="p">,</span> <span class="n">CS</span><span class="o">.</span><span class="n">levels</span><span class="p">,</span> <span class="n">inline</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">fmt</span><span class="o">=</span><span class="n">fmt</span><span class="p">,</span> <span class="n">fontsize</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span>
<span class="c">##################################################</span>
<span class="c"># Label contours with arbitrary strings using a</span>
<span class="c"># dictionary</span>
<span class="c">##################################################</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
<span class="c"># Basic contour plot</span>
<span class="n">CS</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">contour</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="n">Z</span><span class="p">)</span>
<span class="n">fmt</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">strs</span> <span class="o">=</span> <span class="p">[</span> <span class="s">'first'</span><span class="p">,</span> <span class="s">'second'</span><span class="p">,</span> <span class="s">'third'</span><span class="p">,</span> <span class="s">'fourth'</span><span class="p">,</span> <span class="s">'fifth'</span><span class="p">,</span> <span class="s">'sixth'</span><span class="p">,</span> <span class="s">'seventh'</span> <span class="p">]</span>
<span class="k">for</span> <span class="n">l</span><span class="p">,</span><span class="n">s</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span> <span class="n">CS</span><span class="o">.</span><span class="n">levels</span><span class="p">,</span> <span class="n">strs</span> <span class="p">):</span>
<span class="n">fmt</span><span class="p">[</span><span class="n">l</span><span class="p">]</span> <span class="o">=</span> <span class="n">s</span>
<span class="c"># Label every other level using strings</span>
<span class="n">plt</span><span class="o">.</span><span class="n">clabel</span><span class="p">(</span><span class="n">CS</span><span class="p">,</span><span class="n">CS</span><span class="o">.</span><span class="n">levels</span><span class="p">[::</span><span class="mi">2</span><span class="p">],</span><span class="n">inline</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span><span class="n">fmt</span><span class="o">=</span><span class="n">fmt</span><span class="p">,</span><span class="n">fontsize</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span>
<span class="c"># Use a Formatter</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
<span class="n">CS</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">contour</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="mi">100</span><span class="o">**</span><span class="n">Z</span><span class="p">,</span> <span class="n">locator</span><span class="o">=</span><span class="n">plt</span><span class="o">.</span><span class="n">LogLocator</span><span class="p">())</span>
<span class="n">fmt</span> <span class="o">=</span> <span class="n">ticker</span><span class="o">.</span><span class="n">LogFormatterMathtext</span><span class="p">()</span>
<span class="n">fmt</span><span class="o">.</span><span class="n">create_dummy_axis</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">clabel</span><span class="p">(</span><span class="n">CS</span><span class="p">,</span> <span class="n">CS</span><span class="o">.</span><span class="n">levels</span><span class="p">,</span> <span class="n">fmt</span><span class="o">=</span><span class="n">fmt</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">title</span><span class="p">(</span><span class="s">"$100^Z$"</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>
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