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<title>Legend using pre-defined labels — Matplotlib 2.1.0 documentation</title>
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<div class="section" id="legend-using-pre-defined-labels">
<span id="sphx-glr-gallery-api-legend-py"></span><h1>Legend using pre-defined labels<a class="headerlink" href="#legend-using-pre-defined-labels" title="Permalink to this headline">¶</a></h1>
<p>Notice how the legend labels are defined with the plots!</p>
<img alt="../../_images/sphx_glr_legend_001.png" class="align-center" src="../../_images/sphx_glr_legend_001.png" />
<div class="highlight-python"><div class="highlight"><pre><span></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="c1"># Make some fake data.</span>
<span class="n">a</span> <span class="o">=</span> <span class="n">b</span> <span class="o">=</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html#numpy.arange" title="View documentation for numpy.arange"><span class="n">np</span><span class="o">.</span><span class="n">arange</span></a><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="o">.</span><span class="mo">02</span><span class="p">)</span>
<span class="n">c</span> <span class="o">=</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.exp.html#numpy.exp" title="View documentation for numpy.exp"><span class="n">np</span><span class="o">.</span><span class="n">exp</span></a><span class="p">(</span><span class="n">a</span><span class="p">)</span>
<span class="n">d</span> <span class="o">=</span> <span class="n">c</span><span class="p">[::</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
<span class="c1"># Create plots with pre-defined labels.</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots"><span class="n">plt</span><span class="o">.</span><span class="n">subplots</span></a><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">a</span><span class="p">,</span> <span class="n">c</span><span class="p">,</span> <span class="s1">'k--'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">'Model length'</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">a</span><span class="p">,</span> <span class="n">d</span><span class="p">,</span> <span class="s1">'k:'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">'Data length'</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">a</span><span class="p">,</span> <span class="n">c</span> <span class="o">+</span> <span class="n">d</span><span class="p">,</span> <span class="s1">'k'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">'Total message length'</span><span class="p">)</span>
<span class="n">legend</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">legend</span><span class="p">(</span><span class="n">loc</span><span class="o">=</span><span class="s1">'upper center'</span><span class="p">,</span> <span class="n">shadow</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">fontsize</span><span class="o">=</span><span class="s1">'x-large'</span><span class="p">)</span>
<span class="c1"># Put a nicer background color on the legend.</span>
<span class="n">legend</span><span class="o">.</span><span class="n">get_frame</span><span class="p">()</span><span class="o">.</span><span class="n">set_facecolor</span><span class="p">(</span><span class="s1">'#00FFCC'</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.pyplot.show.html#matplotlib.pyplot.show" title="View documentation for matplotlib.pyplot.show"><span class="n">plt</span><span class="o">.</span><span class="n">show</span></a><span class="p">()</span>
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