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<div class="section" id="units-example-code-bar-demo2-py">
<span id="units-bar-demo2"></span><h1>units example code: bar_demo2.py<a class="headerlink" href="#units-example-code-bar-demo2-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/units/bar_demo2.py">Source code</a>, <a class="reference external" href="../../mpl_examples/units/bar_demo2.png">png</a>, <a class="reference external" href="../../mpl_examples/units/bar_demo2.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/units/bar_demo2.pdf">pdf</a>)</p>
<div class="figure">
<img alt="../../_images/bar_demo2.png" src="../../_images/bar_demo2.png" />
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""</span>
<span class="sd">plot using a variety of cm vs inches conversions. The example shows</span>
<span class="sd">how default unit instrospection works (ax1), how various keywords can</span>
<span class="sd">be used to set the x and y units to override the defaults (ax2, ax3,</span>
<span class="sd">ax4) and how one can set the xlimits using scalars (ax3, current units</span>
<span class="sd">assumed) or units (conversions applied to get the numbers to current</span>
<span class="sd">units)</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="kn">from</span> <span class="nn">basic_units</span> <span class="kn">import</span> <span class="n">cm</span><span class="p">,</span> <span class="n">inch</span>
<span class="kn">from</span> <span class="nn">pylab</span> <span class="kn">import</span> <span class="n">figure</span><span class="p">,</span> <span class="n">show</span>
<span class="n">cms</span> <span class="o">=</span> <span class="n">cm</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="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">bottom</span><span class="o">=</span><span class="mi">0</span><span class="o">*</span><span class="n">cm</span>
<span class="n">width</span><span class="o">=</span><span class="mf">0.8</span><span class="o">*</span><span class="n">cm</span>
<span class="n">fig</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">ax1</span><span class="o">.</span><span class="n">bar</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">bottom</span><span class="o">=</span><span class="n">bottom</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">bar</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">bottom</span><span class="o">=</span><span class="n">bottom</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="n">width</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">bar</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">bottom</span><span class="o">=</span><span class="n">bottom</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="n">width</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">2</span><span class="p">,</span> <span class="mi">6</span><span class="p">)</span> <span class="c"># 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">bar</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">bottom</span><span class="o">=</span><span class="n">bottom</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="n">width</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="c">#fig.savefig('simple_conversion_plot.png')</span>
<span class="n">ax4</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span><span class="mi">2</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="c"># cm are converted to inches</span>
<span class="n">show</span><span class="p">()</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"><em>Search examples</em></a>)</p>
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