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<div class="section" id="annotation-with-units">
<span id="sphx-glr-gallery-units-annotate-with-units-py"></span><h1>Annotation with units<a class="headerlink" href="#annotation-with-units" title="Permalink to this headline">¶</a></h1>
<p>The example illustrates how to create text and arrow
annotations using a centimeter-scale plot.</p>
<p>This example requires <a class="reference download internal" href="../../_downloads/basic_units.py" download=""><code class="xref download docutils literal"><span class="pre">basic_units.py</span></code></a></p>
<img alt="../../_images/sphx_glr_annotate_with_units_001.png" class="align-center" src="../../_images/sphx_glr_annotate_with_units_001.png" />
<div class="highlight-python"><div class="highlight"><pre><span></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">from</span> <span class="nn">basic_units</span> <span class="kn">import</span> <span class="n">cm</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">annotate</span><span class="p">(</span><span class="s2">"Note 01"</span><span class="p">,</span> <span class="p">[</span><span class="mf">0.5</span><span class="o">*</span><span class="n">cm</span><span class="p">,</span> <span class="mf">0.5</span><span class="o">*</span><span class="n">cm</span><span class="p">])</span>
<span class="c1"># xy and text both unitized</span>
<span class="n">ax</span><span class="o">.</span><span class="n">annotate</span><span class="p">(</span><span class="s1">'local max'</span><span class="p">,</span> <span class="n">xy</span><span class="o">=</span><span class="p">(</span><span class="mi">3</span><span class="o">*</span><span class="n">cm</span><span class="p">,</span> <span class="mi">1</span><span class="o">*</span><span class="n">cm</span><span class="p">),</span> <span class="n">xycoords</span><span class="o">=</span><span class="s1">'data'</span><span class="p">,</span>
<span class="n">xytext</span><span class="o">=</span><span class="p">(</span><span class="mf">0.8</span><span class="o">*</span><span class="n">cm</span><span class="p">,</span> <span class="mf">0.95</span><span class="o">*</span><span class="n">cm</span><span class="p">),</span> <span class="n">textcoords</span><span class="o">=</span><span class="s1">'data'</span><span class="p">,</span>
<span class="n">arrowprops</span><span class="o">=</span><span class="nb">dict</span><span class="p">(</span><span class="n">facecolor</span><span class="o">=</span><span class="s1">'black'</span><span class="p">,</span> <span class="n">shrink</span><span class="o">=</span><span class="mf">0.05</span><span class="p">),</span>
<span class="n">horizontalalignment</span><span class="o">=</span><span class="s1">'right'</span><span class="p">,</span> <span class="n">verticalalignment</span><span class="o">=</span><span class="s1">'top'</span><span class="p">)</span>
<span class="c1"># mixing units w/ nonunits</span>
<span class="n">ax</span><span class="o">.</span><span class="n">annotate</span><span class="p">(</span><span class="s1">'local max'</span><span class="p">,</span> <span class="n">xy</span><span class="o">=</span><span class="p">(</span><span class="mi">3</span><span class="o">*</span><span class="n">cm</span><span class="p">,</span> <span class="mi">1</span><span class="o">*</span><span class="n">cm</span><span class="p">),</span> <span class="n">xycoords</span><span class="o">=</span><span class="s1">'data'</span><span class="p">,</span>
<span class="n">xytext</span><span class="o">=</span><span class="p">(</span><span class="mf">0.8</span><span class="p">,</span> <span class="mf">0.95</span><span class="p">),</span> <span class="n">textcoords</span><span class="o">=</span><span class="s1">'axes fraction'</span><span class="p">,</span>
<span class="n">arrowprops</span><span class="o">=</span><span class="nb">dict</span><span class="p">(</span><span class="n">facecolor</span><span class="o">=</span><span class="s1">'black'</span><span class="p">,</span> <span class="n">shrink</span><span class="o">=</span><span class="mf">0.05</span><span class="p">),</span>
<span class="n">horizontalalignment</span><span class="o">=</span><span class="s1">'right'</span><span class="p">,</span> <span class="n">verticalalignment</span><span class="o">=</span><span class="s1">'top'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span><span class="mi">0</span><span class="o">*</span><span class="n">cm</span><span class="p">,</span> <span class="mi">4</span><span class="o">*</span><span class="n">cm</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_ylim</span><span class="p">(</span><span class="mi">0</span><span class="o">*</span><span class="n">cm</span><span class="p">,</span> <span class="mi">4</span><span class="o">*</span><span class="n">cm</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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<p><strong>Total running time of the script:</strong> ( 0 minutes 0.026 seconds)</p>
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<a class="reference download internal" href="../../_downloads/annotate_with_units.py" download=""><code class="xref download docutils literal"><span class="pre">Download</span> <span class="pre">Python</span> <span class="pre">source</span> <span class="pre">code:</span> <span class="pre">annotate_with_units.py</span></code></a></div>
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<a class="reference download internal" href="../../_downloads/annotate_with_units.ipynb" download=""><code class="xref download docutils literal"><span class="pre">Download</span> <span class="pre">Jupyter</span> <span class="pre">notebook:</span> <span class="pre">annotate_with_units.ipynb</span></code></a></div>
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