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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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<span id="units-units-sample"></span><h1>units example code: units_sample.py<a class="headerlink" href="#units-example-code-units-sample-py" title="Permalink to this headline">¶</a></h1>

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

</div>

<span class="sd">Inches and Centimeters</span>

<span class="sd">The example illustrates the ability to override default x and y units (ax1) to</span>

<span class="sd">inches and centimeters using the `xunits` and `yunits` parameters for the</span>

<span class="sd">`plot` function. Note that conversions are applied to get numbers to correct</span>

<span class="sd">units.</span>

<span class="kn">from</span> <span class="nn">basic_units</span> <span class="k">import</span> <span class="n">cm</span><span class="p">,</span> <span class="n">inch</span>

<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>

<span class="kn">import</span> <span class="nn">numpy</span>

<span class="n">cms</span> <span class="o">=</span> <span class="n">cm</span> <span class="o">*</span> <span class="n">numpy</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>

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

<span class="n">ax1</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>

<span class="n">ax2</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">2</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">cms</span><span class="p">,</span> <span class="n">cms</span><span class="p">,</span> <span class="n">xunits</span><span class="o">=</span><span class="n">cm</span><span class="p">,</span> <span class="n">yunits</span><span class="o">=</span><span class="n">inch</span><span class="p">)</span>

<span class="n">ax3</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>

<span class="n">ax3</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">cms</span><span class="p">,</span> <span class="n">cms</span><span class="p">,</span> <span class="n">xunits</span><span class="o">=</span><span class="n">inch</span><span class="p">,</span> <span class="n">yunits</span><span class="o">=</span><span class="n">cm</span><span class="p">)</span>

<span class="n">ax3</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">6</span><span class="p">)</span> <span class="c1"># scalars are interpreted in current units</span>

<span class="n">ax4</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">)</span>

<span class="n">ax4</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">cms</span><span class="p">,</span> <span class="n">cms</span><span class="p">,</span> <span class="n">xunits</span><span class="o">=</span><span class="n">inch</span><span class="p">,</span> <span class="n">yunits</span><span class="o">=</span><span class="n">inch</span><span class="p">)</span>

<span class="n">ax4</span><span class="o">.</span><span class="n">set_xlim</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">6</span><span class="o">*</span><span class="n">cm</span><span class="p">)</span> <span class="c1"># cm are converted to inches</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"><span class="std std-ref">Search examples</span></a>)</p>

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