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<div class="section" id="pylab-examples-example-code-tricontour-demo-py">
<span id="pylab-examples-tricontour-demo"></span><h1>pylab_examples example code: tricontour_demo.py<a class="headerlink" href="#pylab-examples-example-code-tricontour-demo-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/pylab_examples/tricontour_demo.py">Source code</a>)</p>
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<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""</span>
<span class="sd">Contour plots of unstructured triangular grids.</span>
<span class="sd">"""</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.tri</span> <span class="kn">as</span> <span class="nn">tri</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">math</span>
<span class="c"># Creating a Triangulation without specifying the triangles results in the</span>
<span class="c"># Delaunay triangulation of the points.</span>
<span class="c"># First create the x and y coordinates of the points.</span>
<span class="n">n_angles</span> <span class="o">=</span> <span class="mi">48</span>
<span class="n">n_radii</span> <span class="o">=</span> <span class="mi">8</span>
<span class="n">min_radius</span> <span class="o">=</span> <span class="mf">0.25</span>
<span class="n">radii</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">linspace</span><span class="p">(</span><span class="n">min_radius</span><span class="p">,</span> <span class="mf">0.95</span><span class="p">,</span> <span class="n">n_radii</span><span class="p">)</span>
<span class="n">angles</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">linspace</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="o">*</span><span class="n">math</span><span class="o">.</span><span class="n">pi</span><span class="p">,</span> <span class="n">n_angles</span><span class="p">,</span> <span class="n">endpoint</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="n">angles</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">repeat</span><span class="p">(</span><span class="n">angles</span><span class="p">[</span><span class="o">...</span><span class="p">,</span><span class="n">np</span><span class="o">.</span><span class="n">newaxis</span><span class="p">],</span> <span class="n">n_radii</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">angles</span><span class="p">[:,</span><span class="mi">1</span><span class="p">::</span><span class="mi">2</span><span class="p">]</span> <span class="o">+=</span> <span class="n">math</span><span class="o">.</span><span class="n">pi</span><span class="o">/</span><span class="n">n_angles</span>
<span class="n">x</span> <span class="o">=</span> <span class="p">(</span><span class="n">radii</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">cos</span><span class="p">(</span><span class="n">angles</span><span class="p">))</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span>
<span class="n">y</span> <span class="o">=</span> <span class="p">(</span><span class="n">radii</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">sin</span><span class="p">(</span><span class="n">angles</span><span class="p">))</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span>
<span class="n">z</span> <span class="o">=</span> <span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">cos</span><span class="p">(</span><span class="n">radii</span><span class="p">)</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">cos</span><span class="p">(</span><span class="n">angles</span><span class="o">*</span><span class="mf">3.0</span><span class="p">))</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span>
<span class="c"># Create the Triangulation; no triangles so Delaunay triangulation created.</span>
<span class="n">triang</span> <span class="o">=</span> <span class="n">tri</span><span class="o">.</span><span class="n">Triangulation</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"># Mask off unwanted triangles.</span>
<span class="n">xmid</span> <span class="o">=</span> <span class="n">x</span><span class="p">[</span><span class="n">triang</span><span class="o">.</span><span class="n">triangles</span><span class="p">]</span><span class="o">.</span><span class="n">mean</span><span class="p">(</span><span class="n">axis</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">ymid</span> <span class="o">=</span> <span class="n">y</span><span class="p">[</span><span class="n">triang</span><span class="o">.</span><span class="n">triangles</span><span class="p">]</span><span class="o">.</span><span class="n">mean</span><span class="p">(</span><span class="n">axis</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">mask</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">xmid</span><span class="o">*</span><span class="n">xmid</span> <span class="o">+</span> <span class="n">ymid</span><span class="o">*</span><span class="n">ymid</span> <span class="o"><</span> <span class="n">min_radius</span><span class="o">*</span><span class="n">min_radius</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="n">triang</span><span class="o">.</span><span class="n">set_mask</span><span class="p">(</span><span class="n">mask</span><span class="p">)</span>
<span class="c"># pcolor plot.</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">gca</span><span class="p">()</span><span class="o">.</span><span class="n">set_aspect</span><span class="p">(</span><span class="s">'equal'</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">tricontourf</span><span class="p">(</span><span class="n">triang</span><span class="p">,</span> <span class="n">z</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">colorbar</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">tricontour</span><span class="p">(</span><span class="n">triang</span><span class="p">,</span> <span class="n">z</span><span class="p">,</span> <span class="n">colors</span><span class="o">=</span><span class="s">'k'</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">'Contour plot of Delaunay triangulation'</span><span class="p">)</span>
<span class="c"># You can specify your own triangulation rather than perform a Delaunay</span>
<span class="c"># triangulation of the points, where each triangle is given by the indices of</span>
<span class="c"># the three points that make up the triangle, ordered in either a clockwise or</span>
<span class="c"># anticlockwise manner.</span>
<span class="n">xy</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">asarray</span><span class="p">([</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.101</span><span class="p">,</span><span class="mf">0.872</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.080</span><span class="p">,</span><span class="mf">0.883</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.069</span><span class="p">,</span><span class="mf">0.888</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.054</span><span class="p">,</span><span class="mf">0.890</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.045</span><span class="p">,</span><span class="mf">0.897</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.057</span><span class="p">,</span><span class="mf">0.895</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.073</span><span class="p">,</span><span class="mf">0.900</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.087</span><span class="p">,</span><span class="mf">0.898</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.090</span><span class="p">,</span><span class="mf">0.904</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.069</span><span class="p">,</span><span class="mf">0.907</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.069</span><span class="p">,</span><span class="mf">0.921</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.080</span><span class="p">,</span><span class="mf">0.919</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.073</span><span class="p">,</span><span class="mf">0.928</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.052</span><span class="p">,</span><span class="mf">0.930</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.048</span><span class="p">,</span><span class="mf">0.942</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.062</span><span class="p">,</span><span class="mf">0.949</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.054</span><span class="p">,</span><span class="mf">0.958</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.069</span><span class="p">,</span><span class="mf">0.954</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.087</span><span class="p">,</span><span class="mf">0.952</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.087</span><span class="p">,</span><span class="mf">0.959</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.080</span><span class="p">,</span><span class="mf">0.966</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.085</span><span class="p">,</span><span class="mf">0.973</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.087</span><span class="p">,</span><span class="mf">0.965</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.097</span><span class="p">,</span><span class="mf">0.965</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.097</span><span class="p">,</span><span class="mf">0.975</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.092</span><span class="p">,</span><span class="mf">0.984</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.101</span><span class="p">,</span><span class="mf">0.980</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.108</span><span class="p">,</span><span class="mf">0.980</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.104</span><span class="p">,</span><span class="mf">0.987</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.102</span><span class="p">,</span><span class="mf">0.993</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.115</span><span class="p">,</span><span class="mf">1.001</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.099</span><span class="p">,</span><span class="mf">0.996</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.101</span><span class="p">,</span><span class="mf">1.007</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.090</span><span class="p">,</span><span class="mf">1.010</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.087</span><span class="p">,</span><span class="mf">1.021</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.069</span><span class="p">,</span><span class="mf">1.021</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.052</span><span class="p">,</span><span class="mf">1.022</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.052</span><span class="p">,</span><span class="mf">1.017</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.069</span><span class="p">,</span><span class="mf">1.010</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.064</span><span class="p">,</span><span class="mf">1.005</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.048</span><span class="p">,</span><span class="mf">1.005</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.031</span><span class="p">,</span><span class="mf">1.005</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.031</span><span class="p">,</span><span class="mf">0.996</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.040</span><span class="p">,</span><span class="mf">0.987</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.045</span><span class="p">,</span><span class="mf">0.980</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.052</span><span class="p">,</span><span class="mf">0.975</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.040</span><span class="p">,</span><span class="mf">0.973</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.026</span><span class="p">,</span><span class="mf">0.968</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.020</span><span class="p">,</span><span class="mf">0.954</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.006</span><span class="p">,</span><span class="mf">0.947</span><span class="p">],</span>
<span class="p">[</span> <span class="mf">0.003</span><span class="p">,</span><span class="mf">0.935</span><span class="p">],[</span> <span class="mf">0.006</span><span class="p">,</span><span class="mf">0.926</span><span class="p">],[</span> <span class="mf">0.005</span><span class="p">,</span><span class="mf">0.921</span><span class="p">],[</span> <span class="mf">0.022</span><span class="p">,</span><span class="mf">0.923</span><span class="p">],[</span> <span class="mf">0.033</span><span class="p">,</span><span class="mf">0.912</span><span class="p">],</span>
<span class="p">[</span> <span class="mf">0.029</span><span class="p">,</span><span class="mf">0.905</span><span class="p">],[</span> <span class="mf">0.017</span><span class="p">,</span><span class="mf">0.900</span><span class="p">],[</span> <span class="mf">0.012</span><span class="p">,</span><span class="mf">0.895</span><span class="p">],[</span> <span class="mf">0.027</span><span class="p">,</span><span class="mf">0.893</span><span class="p">],[</span> <span class="mf">0.019</span><span class="p">,</span><span class="mf">0.886</span><span class="p">],</span>
<span class="p">[</span> <span class="mf">0.001</span><span class="p">,</span><span class="mf">0.883</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.012</span><span class="p">,</span><span class="mf">0.884</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.029</span><span class="p">,</span><span class="mf">0.883</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.038</span><span class="p">,</span><span class="mf">0.879</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.057</span><span class="p">,</span><span class="mf">0.881</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.062</span><span class="p">,</span><span class="mf">0.876</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.078</span><span class="p">,</span><span class="mf">0.876</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.087</span><span class="p">,</span><span class="mf">0.872</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.030</span><span class="p">,</span><span class="mf">0.907</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.007</span><span class="p">,</span><span class="mf">0.905</span><span class="p">],</span>
<span class="p">[</span><span class="o">-</span><span class="mf">0.057</span><span class="p">,</span><span class="mf">0.916</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.025</span><span class="p">,</span><span class="mf">0.933</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.077</span><span class="p">,</span><span class="mf">0.990</span><span class="p">],[</span><span class="o">-</span><span class="mf">0.059</span><span class="p">,</span><span class="mf">0.993</span><span class="p">]</span> <span class="p">])</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">xy</span><span class="p">[:,</span><span class="mi">0</span><span class="p">]</span><span class="o">*</span><span class="mi">180</span><span class="o">/</span><span class="mf">3.14159</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">xy</span><span class="p">[:,</span><span class="mi">1</span><span class="p">]</span><span class="o">*</span><span class="mi">180</span><span class="o">/</span><span class="mf">3.14159</span>
<span class="n">x0</span> <span class="o">=</span> <span class="o">-</span><span class="mi">5</span>
<span class="n">y0</span> <span class="o">=</span> <span class="mi">52</span>
<span class="n">z</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">exp</span><span class="p">(</span><span class="o">-</span><span class="mf">0.01</span><span class="o">*</span><span class="p">(</span> <span class="p">(</span><span class="n">x</span><span class="o">-</span><span class="n">x0</span><span class="p">)</span><span class="o">*</span><span class="p">(</span><span class="n">x</span><span class="o">-</span><span class="n">x0</span><span class="p">)</span> <span class="o">+</span> <span class="p">(</span><span class="n">y</span><span class="o">-</span><span class="n">y0</span><span class="p">)</span><span class="o">*</span><span class="p">(</span><span class="n">y</span><span class="o">-</span><span class="n">y0</span><span class="p">)</span> <span class="p">))</span>
<span class="n">triangles</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">asarray</span><span class="p">([</span>
<span class="p">[</span><span class="mi">67</span><span class="p">,</span><span class="mi">66</span><span class="p">,</span> <span class="mi">1</span><span class="p">],[</span><span class="mi">65</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span><span class="mi">66</span><span class="p">],[</span> <span class="mi">1</span><span class="p">,</span><span class="mi">66</span><span class="p">,</span> <span class="mi">2</span><span class="p">],[</span><span class="mi">64</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span><span class="mi">65</span><span class="p">],[</span><span class="mi">63</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span><span class="mi">64</span><span class="p">],[</span><span class="mi">60</span><span class="p">,</span><span class="mi">59</span><span class="p">,</span><span class="mi">57</span><span class="p">],</span>
<span class="p">[</span> <span class="mi">2</span><span class="p">,</span><span class="mi">64</span><span class="p">,</span> <span class="mi">3</span><span class="p">],[</span> <span class="mi">3</span><span class="p">,</span><span class="mi">63</span><span class="p">,</span> <span class="mi">4</span><span class="p">],[</span> <span class="mi">0</span><span class="p">,</span><span class="mi">67</span><span class="p">,</span> <span class="mi">1</span><span class="p">],[</span><span class="mi">62</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span><span class="mi">63</span><span class="p">],[</span><span class="mi">57</span><span class="p">,</span><span class="mi">59</span><span class="p">,</span><span class="mi">56</span><span class="p">],[</span><span class="mi">59</span><span class="p">,</span><span class="mi">58</span><span class="p">,</span><span class="mi">56</span><span class="p">],</span>
<span class="p">[</span><span class="mi">61</span><span class="p">,</span><span class="mi">60</span><span class="p">,</span><span class="mi">69</span><span class="p">],[</span><span class="mi">57</span><span class="p">,</span><span class="mi">69</span><span class="p">,</span><span class="mi">60</span><span class="p">],[</span> <span class="mi">4</span><span class="p">,</span><span class="mi">62</span><span class="p">,</span><span class="mi">68</span><span class="p">],[</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">9</span><span class="p">],[</span><span class="mi">61</span><span class="p">,</span><span class="mi">68</span><span class="p">,</span><span class="mi">62</span><span class="p">],[</span><span class="mi">69</span><span class="p">,</span><span class="mi">68</span><span class="p">,</span><span class="mi">61</span><span class="p">],</span>
<span class="p">[</span> <span class="mi">9</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span><span class="mi">70</span><span class="p">],[</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">7</span><span class="p">],[</span> <span class="mi">4</span><span class="p">,</span><span class="mi">70</span><span class="p">,</span> <span class="mi">5</span><span class="p">],[</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">9</span><span class="p">],[</span><span class="mi">56</span><span class="p">,</span><span class="mi">69</span><span class="p">,</span><span class="mi">57</span><span class="p">],[</span><span class="mi">69</span><span class="p">,</span><span class="mi">56</span><span class="p">,</span><span class="mi">52</span><span class="p">],</span>
<span class="p">[</span><span class="mi">70</span><span class="p">,</span><span class="mi">10</span><span class="p">,</span> <span class="mi">9</span><span class="p">],[</span><span class="mi">54</span><span class="p">,</span><span class="mi">53</span><span class="p">,</span><span class="mi">55</span><span class="p">],[</span><span class="mi">56</span><span class="p">,</span><span class="mi">55</span><span class="p">,</span><span class="mi">53</span><span class="p">],[</span><span class="mi">68</span><span class="p">,</span><span class="mi">70</span><span class="p">,</span> <span class="mi">4</span><span class="p">],[</span><span class="mi">52</span><span class="p">,</span><span class="mi">56</span><span class="p">,</span><span class="mi">53</span><span class="p">],[</span><span class="mi">11</span><span class="p">,</span><span class="mi">10</span><span class="p">,</span><span class="mi">12</span><span class="p">],</span>
<span class="p">[</span><span class="mi">69</span><span class="p">,</span><span class="mi">71</span><span class="p">,</span><span class="mi">68</span><span class="p">],[</span><span class="mi">68</span><span class="p">,</span><span class="mi">13</span><span class="p">,</span><span class="mi">70</span><span class="p">],[</span><span class="mi">10</span><span class="p">,</span><span class="mi">70</span><span class="p">,</span><span class="mi">13</span><span class="p">],[</span><span class="mi">51</span><span class="p">,</span><span class="mi">50</span><span class="p">,</span><span class="mi">52</span><span class="p">],[</span><span class="mi">13</span><span class="p">,</span><span class="mi">68</span><span class="p">,</span><span class="mi">71</span><span class="p">],[</span><span class="mi">52</span><span class="p">,</span><span class="mi">71</span><span class="p">,</span><span class="mi">69</span><span class="p">],</span>
<span class="p">[</span><span class="mi">12</span><span class="p">,</span><span class="mi">10</span><span class="p">,</span><span class="mi">13</span><span class="p">],[</span><span class="mi">71</span><span class="p">,</span><span class="mi">52</span><span class="p">,</span><span class="mi">50</span><span class="p">],[</span><span class="mi">71</span><span class="p">,</span><span class="mi">14</span><span class="p">,</span><span class="mi">13</span><span class="p">],[</span><span class="mi">50</span><span class="p">,</span><span class="mi">49</span><span class="p">,</span><span class="mi">71</span><span class="p">],[</span><span class="mi">49</span><span class="p">,</span><span class="mi">48</span><span class="p">,</span><span class="mi">71</span><span class="p">],[</span><span class="mi">14</span><span class="p">,</span><span class="mi">16</span><span class="p">,</span><span class="mi">15</span><span class="p">],</span>
<span class="p">[</span><span class="mi">14</span><span class="p">,</span><span class="mi">71</span><span class="p">,</span><span class="mi">48</span><span class="p">],[</span><span class="mi">17</span><span class="p">,</span><span class="mi">19</span><span class="p">,</span><span class="mi">18</span><span class="p">],[</span><span class="mi">17</span><span class="p">,</span><span class="mi">20</span><span class="p">,</span><span class="mi">19</span><span class="p">],[</span><span class="mi">48</span><span class="p">,</span><span class="mi">16</span><span class="p">,</span><span class="mi">14</span><span class="p">],[</span><span class="mi">48</span><span class="p">,</span><span class="mi">47</span><span class="p">,</span><span class="mi">16</span><span class="p">],[</span><span class="mi">47</span><span class="p">,</span><span class="mi">46</span><span class="p">,</span><span class="mi">16</span><span class="p">],</span>
<span class="p">[</span><span class="mi">16</span><span class="p">,</span><span class="mi">46</span><span class="p">,</span><span class="mi">45</span><span class="p">],[</span><span class="mi">23</span><span class="p">,</span><span class="mi">22</span><span class="p">,</span><span class="mi">24</span><span class="p">],[</span><span class="mi">21</span><span class="p">,</span><span class="mi">24</span><span class="p">,</span><span class="mi">22</span><span class="p">],[</span><span class="mi">17</span><span class="p">,</span><span class="mi">16</span><span class="p">,</span><span class="mi">45</span><span class="p">],[</span><span class="mi">20</span><span class="p">,</span><span class="mi">17</span><span class="p">,</span><span class="mi">45</span><span class="p">],[</span><span class="mi">21</span><span class="p">,</span><span class="mi">25</span><span class="p">,</span><span class="mi">24</span><span class="p">],</span>
<span class="p">[</span><span class="mi">27</span><span class="p">,</span><span class="mi">26</span><span class="p">,</span><span class="mi">28</span><span class="p">],[</span><span class="mi">20</span><span class="p">,</span><span class="mi">72</span><span class="p">,</span><span class="mi">21</span><span class="p">],[</span><span class="mi">25</span><span class="p">,</span><span class="mi">21</span><span class="p">,</span><span class="mi">72</span><span class="p">],[</span><span class="mi">45</span><span class="p">,</span><span class="mi">72</span><span class="p">,</span><span class="mi">20</span><span class="p">],[</span><span class="mi">25</span><span class="p">,</span><span class="mi">28</span><span class="p">,</span><span class="mi">26</span><span class="p">],[</span><span class="mi">44</span><span class="p">,</span><span class="mi">73</span><span class="p">,</span><span class="mi">45</span><span class="p">],</span>
<span class="p">[</span><span class="mi">72</span><span class="p">,</span><span class="mi">45</span><span class="p">,</span><span class="mi">73</span><span class="p">],[</span><span class="mi">28</span><span class="p">,</span><span class="mi">25</span><span class="p">,</span><span class="mi">29</span><span class="p">],[</span><span class="mi">29</span><span class="p">,</span><span class="mi">25</span><span class="p">,</span><span class="mi">31</span><span class="p">],[</span><span class="mi">43</span><span class="p">,</span><span class="mi">73</span><span class="p">,</span><span class="mi">44</span><span class="p">],[</span><span class="mi">73</span><span class="p">,</span><span class="mi">43</span><span class="p">,</span><span class="mi">40</span><span class="p">],[</span><span class="mi">72</span><span class="p">,</span><span class="mi">73</span><span class="p">,</span><span class="mi">39</span><span class="p">],</span>
<span class="p">[</span><span class="mi">72</span><span class="p">,</span><span class="mi">31</span><span class="p">,</span><span class="mi">25</span><span class="p">],[</span><span class="mi">42</span><span class="p">,</span><span class="mi">40</span><span class="p">,</span><span class="mi">43</span><span class="p">],[</span><span class="mi">31</span><span class="p">,</span><span class="mi">30</span><span class="p">,</span><span class="mi">29</span><span class="p">],[</span><span class="mi">39</span><span class="p">,</span><span class="mi">73</span><span class="p">,</span><span class="mi">40</span><span class="p">],[</span><span class="mi">42</span><span class="p">,</span><span class="mi">41</span><span class="p">,</span><span class="mi">40</span><span class="p">],[</span><span class="mi">72</span><span class="p">,</span><span class="mi">33</span><span class="p">,</span><span class="mi">31</span><span class="p">],</span>
<span class="p">[</span><span class="mi">32</span><span class="p">,</span><span class="mi">31</span><span class="p">,</span><span class="mi">33</span><span class="p">],[</span><span class="mi">39</span><span class="p">,</span><span class="mi">38</span><span class="p">,</span><span class="mi">72</span><span class="p">],[</span><span class="mi">33</span><span class="p">,</span><span class="mi">72</span><span class="p">,</span><span class="mi">38</span><span class="p">],[</span><span class="mi">33</span><span class="p">,</span><span class="mi">38</span><span class="p">,</span><span class="mi">34</span><span class="p">],[</span><span class="mi">37</span><span class="p">,</span><span class="mi">35</span><span class="p">,</span><span class="mi">38</span><span class="p">],[</span><span class="mi">34</span><span class="p">,</span><span class="mi">38</span><span class="p">,</span><span class="mi">35</span><span class="p">],</span>
<span class="p">[</span><span class="mi">35</span><span class="p">,</span><span class="mi">37</span><span class="p">,</span><span class="mi">36</span><span class="p">]</span> <span class="p">])</span>
<span class="c"># Rather than create a Triangulation object, can simply pass x, y and triangles</span>
<span class="c"># arrays to tripcolor directly. It would be better to use a Triangulation object</span>
<span class="c"># if the same triangulation was to be used more than once to save duplicated</span>
<span class="c"># calculations.</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">gca</span><span class="p">()</span><span class="o">.</span><span class="n">set_aspect</span><span class="p">(</span><span class="s">'equal'</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">tricontourf</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">triangles</span><span class="p">,</span> <span class="n">z</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">colorbar</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">'Contour plot of user-specified triangulation'</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s">'Longitude (degrees)'</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s">'Latitude (degrees)'</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>
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