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<div class="section" id="using-span-where">
<span id="sphx-glr-gallery-api-span-regions-py"></span><h1>Using span_where<a class="headerlink" href="#using-span-where" title="Permalink to this headline">¶</a></h1>
<p>Illustrate some helper functions for shading regions where a logical
mask is True</p>
<p>See <a class="reference internal" href="../../api/collections_api.html#matplotlib.collections.BrokenBarHCollection.span_where" title="matplotlib.collections.BrokenBarHCollection.span_where"><code class="xref py py-meth docutils literal"><span class="pre">matplotlib.collections.BrokenBarHCollection.span_where()</span></code></a></p>
<img alt="../../_images/sphx_glr_span_regions_001.png" class="align-center" src="../../_images/sphx_glr_span_regions_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="kn">import</span> <span class="nn">matplotlib.collections</span> <span class="kn">as</span> <span class="nn">collections</span>
<span class="n">t</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="mf">0.0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mf">0.01</span><span class="p">)</span>
<span class="n">s1</span> <span class="o">=</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.sin.html#numpy.sin" title="View documentation for numpy.sin"><span class="n">np</span><span class="o">.</span><span class="n">sin</span></a><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">s2</span> <span class="o">=</span> <span class="mf">1.2</span><span class="o">*</span><a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.sin.html#numpy.sin" title="View documentation for numpy.sin"><span class="n">np</span><span class="o">.</span><span class="n">sin</span></a><span class="p">(</span><span class="mi">4</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">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">set_title</span><span class="p">(</span><span class="s1">'using span_where'</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">t</span><span class="p">,</span> <span class="n">s1</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s1">'black'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">axhline</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s1">'black'</span><span class="p">,</span> <span class="n">lw</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
<span class="n">collection</span> <span class="o">=</span> <a href="../../api/collections_api.html#matplotlib.collections.BrokenBarHCollection.span_where" title="View documentation for matplotlib.collections.BrokenBarHCollection.span_where"><span class="n">collections</span><span class="o">.</span><span class="n">BrokenBarHCollection</span><span class="o">.</span><span class="n">span_where</span></a><span class="p">(</span>
<span class="n">t</span><span class="p">,</span> <span class="n">ymin</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">ymax</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">where</span><span class="o">=</span><span class="n">s1</span> <span class="o">></span> <span class="mi">0</span><span class="p">,</span> <span class="n">facecolor</span><span class="o">=</span><span class="s1">'green'</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_collection</span><span class="p">(</span><span class="n">collection</span><span class="p">)</span>
<span class="n">collection</span> <span class="o">=</span> <a href="../../api/collections_api.html#matplotlib.collections.BrokenBarHCollection.span_where" title="View documentation for matplotlib.collections.BrokenBarHCollection.span_where"><span class="n">collections</span><span class="o">.</span><span class="n">BrokenBarHCollection</span><span class="o">.</span><span class="n">span_where</span></a><span class="p">(</span>
<span class="n">t</span><span class="p">,</span> <span class="n">ymin</span><span class="o">=-</span><span class="mi">1</span><span class="p">,</span> <span class="n">ymax</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">where</span><span class="o">=</span><span class="n">s1</span> <span class="o"><</span> <span class="mi">0</span><span class="p">,</span> <span class="n">facecolor</span><span class="o">=</span><span class="s1">'red'</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_collection</span><span class="p">(</span><span class="n">collection</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>
</pre></div>
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