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<div class="section" id="api-example-code-two-scales-py">

<span id="api-two-scales"></span><h1>api example code: two_scales.py<a class="headerlink" href="#api-example-code-two-scales-py" title="Permalink to this headline">¶</a></h1>

<p>(<a class="reference external" href="../../mpl_examples/api/two_scales.py">Source code</a>, <a class="reference external" href="../../mpl_examples/api/two_scales.png">png</a>, <a class="reference external" href="../../mpl_examples/api/two_scales.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/api/two_scales.pdf">pdf</a>)</p>

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<img alt="../../_images/two_scales.png" src="../../_images/two_scales.png" />

<div class="highlight-python"><div class="highlight"><pre><span class="ch">#!/usr/bin/env python</span>

<span class="sd">&quot;&quot;&quot;</span>

<span class="sd">Demonstrate how to do two plots on the same axes with different left</span>

<span class="sd">right scales.</span>

<span class="sd">The trick is to use *2 different axes*. Turn the axes rectangular</span>

<span class="sd">frame off on the 2nd axes to keep it from obscuring the first.</span>

<span class="sd">Manually set the tick locs and labels as desired. You can use</span>

<span class="sd">separate matplotlib.ticker formatters and locators as desired since</span>

<span class="sd">the two axes are independent.</span>

<span class="sd">This is achieved in the following example by calling the Axes.twinx()</span>

<span class="sd">method, which performs this work. See the source of twinx() in</span>

<span class="sd">axes.py for an example of how to do it for different x scales. (Hint:</span>

<span class="sd">use the xaxis instance and call tick_bottom and tick_top in place of</span>

<span class="sd">tick_left and tick_right.)</span>

<span class="sd">The twinx and twiny methods are also exposed as pyplot functions.</span>

<span class="sd">&quot;&quot;&quot;</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="n">fig</span><span class="p">,</span> <span class="n">ax1</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">subplots</span><span class="p">()</span>

<span class="n">t</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="mf">0.01</span><span class="p">,</span> <span class="mf">10.0</span><span class="p">,</span> <span class="mf">0.01</span><span class="p">)</span>

<span class="n">s1</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="n">t</span><span class="p">)</span>

<span class="n">ax1</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">s1</span><span class="p">,</span> <span class="s1">&#39;b-&#39;</span><span class="p">)</span>

<span class="n">ax1</span><span class="o">.</span><span class="n">set_xlabel</span><span class="p">(</span><span class="s1">&#39;time (s)&#39;</span><span class="p">)</span>

<span class="c1"># Make the y-axis label and tick labels match the line color.</span>

<span class="n">ax1</span><span class="o">.</span><span class="n">set_ylabel</span><span class="p">(</span><span class="s1">&#39;exp&#39;</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s1">&#39;b&#39;</span><span class="p">)</span>

<span class="k">for</span> <span class="n">tl</span> <span class="ow">in</span> <span class="n">ax1</span><span class="o">.</span><span class="n">get_yticklabels</span><span class="p">():</span>

<span class="n">tl</span><span class="o">.</span><span class="n">set_color</span><span class="p">(</span><span class="s1">&#39;b&#39;</span><span class="p">)</span>

<span class="n">ax2</span> <span class="o">=</span> <span class="n">ax1</span><span class="o">.</span><span class="n">twinx</span><span class="p">()</span>

<span class="n">s2</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="mi">2</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">pi</span><span class="o">*</span><span class="n">t</span><span class="p">)</span>

<span class="n">ax2</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">s2</span><span class="p">,</span> <span class="s1">&#39;r.&#39;</span><span class="p">)</span>

<span class="n">ax2</span><span class="o">.</span><span class="n">set_ylabel</span><span class="p">(</span><span class="s1">&#39;sin&#39;</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s1">&#39;r&#39;</span><span class="p">)</span>

<span class="k">for</span> <span class="n">tl</span> <span class="ow">in</span> <span class="n">ax2</span><span class="o">.</span><span class="n">get_yticklabels</span><span class="p">():</span>

<span class="n">tl</span><span class="o">.</span><span class="n">set_color</span><span class="p">(</span><span class="s1">&#39;r&#39;</span><span class="p">)</span>

<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>

<p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><span>Search examples</span></a>)</p>

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