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<div class="section" id="pylab-examples-example-code-image-demo2-py">
<span id="pylab-examples-image-demo2"></span><h1>pylab_examples example code: image_demo2.py<a class="headerlink" href="#pylab-examples-example-code-image-demo2-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/pylab_examples/image_demo2.py">Source code</a>)</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="kn">from</span> <span class="nn">pylab</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">import</span> <span class="nn">matplotlib.cbook</span> <span class="kn">as</span> <span class="nn">cbook</span>
<span class="n">w</span><span class="p">,</span> <span class="n">h</span> <span class="o">=</span> <span class="mi">512</span><span class="p">,</span> <span class="mi">512</span>
<span class="n">datafile</span> <span class="o">=</span> <span class="n">cbook</span><span class="o">.</span><span class="n">get_sample_data</span><span class="p">(</span><span class="s">'ct.raw'</span><span class="p">,</span> <span class="n">asfileobj</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="k">print</span> <span class="s">'loading'</span><span class="p">,</span> <span class="n">datafile</span>
<span class="n">s</span> <span class="o">=</span> <span class="nb">file</span><span class="p">(</span><span class="n">datafile</span><span class="p">,</span> <span class="s">'rb'</span><span class="p">)</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="n">A</span> <span class="o">=</span> <span class="n">fromstring</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">uint16</span><span class="p">)</span><span class="o">.</span><span class="n">astype</span><span class="p">(</span><span class="nb">float</span><span class="p">)</span>
<span class="n">A</span> <span class="o">*=</span> <span class="mf">1.0</span><span class="o">/</span><span class="nb">max</span><span class="p">(</span><span class="n">A</span><span class="p">)</span>
<span class="n">A</span><span class="o">.</span><span class="n">shape</span> <span class="o">=</span> <span class="n">w</span><span class="p">,</span> <span class="n">h</span>
<span class="n">extent</span> <span class="o">=</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">25</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">25</span><span class="p">)</span>
<span class="n">im</span> <span class="o">=</span> <span class="n">imshow</span><span class="p">(</span><span class="n">A</span><span class="p">,</span> <span class="n">cmap</span><span class="o">=</span><span class="n">cm</span><span class="o">.</span><span class="n">hot</span><span class="p">,</span> <span class="n">origin</span><span class="o">=</span><span class="s">'upper'</span><span class="p">,</span> <span class="n">extent</span><span class="o">=</span><span class="n">extent</span><span class="p">)</span>
<span class="n">markers</span> <span class="o">=</span> <span class="p">[(</span><span class="mf">15.9</span><span class="p">,</span> <span class="mf">14.5</span><span class="p">),</span> <span class="p">(</span><span class="mf">16.8</span><span class="p">,</span> <span class="mi">15</span><span class="p">)]</span>
<span class="n">x</span><span class="p">,</span><span class="n">y</span> <span class="o">=</span> <span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="n">markers</span><span class="p">)</span>
<span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="s">'o'</span><span class="p">)</span>
<span class="c">#axis([0,25,0,25])</span>
<span class="c">#axis('off')</span>
<span class="n">title</span><span class="p">(</span><span class="s">'CT density'</span><span class="p">)</span>
<span class="k">if</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">asum</span><span class="p">(</span><span class="n">A</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">subplot</span><span class="p">(</span><span class="mi">212</span><span class="p">)</span>
<span class="n">bar</span><span class="p">(</span><span class="n">arange</span><span class="p">(</span><span class="n">w</span><span class="p">),</span> <span class="n">x</span><span class="p">)</span>
<span class="n">xlim</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="n">h</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span>
<span class="n">ylabel</span><span class="p">(</span><span class="s">'density'</span><span class="p">)</span>
<span class="n">setp</span><span class="p">(</span><span class="n">gca</span><span class="p">(),</span> <span class="s">'xticklabels'</span><span class="p">,</span> <span class="p">[])</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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