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<div class="section" id="pylab-examples-example-code-data-helper-py">
<span id="pylab-examples-data-helper"></span><h1>pylab_examples example code: data_helper.py<a class="headerlink" href="#pylab-examples-example-code-data-helper-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/pylab_examples/data_helper.py">Source code</a>)</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="c"># Some functions to load a return data for the plot demos</span>
<span class="kn">from</span> <span class="nn">numpy</span> <span class="kn">import</span> <span class="n">fromstring</span><span class="p">,</span> <span class="n">argsort</span><span class="p">,</span> <span class="n">take</span><span class="p">,</span> <span class="n">array</span><span class="p">,</span> <span class="n">resize</span>
<span class="kn">import</span> <span class="nn">matplotlib.cbook</span> <span class="kn">as</span> <span class="nn">cbook</span>
<span class="k">def</span> <span class="nf">get_two_stock_data</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> load stock time and price data for two stocks The return values</span>
<span class="sd"> (d1,p1,d2,p2) are the trade time (in days) and prices for stocks 1</span>
<span class="sd"> and 2 (intc and aapl)</span>
<span class="sd"> """</span>
<span class="n">ticker1</span><span class="p">,</span> <span class="n">ticker2</span> <span class="o">=</span> <span class="s">'INTC'</span><span class="p">,</span> <span class="s">'AAPL'</span>
<span class="n">file1</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">'INTC.dat'</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="n">file2</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">'AAPL.dat'</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="n">M1</span> <span class="o">=</span> <span class="n">fromstring</span><span class="p">(</span> <span class="nb">file</span><span class="p">(</span><span class="n">file1</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="s">'<d'</span><span class="p">)</span>
<span class="n">M1</span> <span class="o">=</span> <span class="n">resize</span><span class="p">(</span><span class="n">M1</span><span class="p">,</span> <span class="p">(</span><span class="n">M1</span><span class="o">.</span><span class="n">shape</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span> <span class="p">)</span>
<span class="n">M2</span> <span class="o">=</span> <span class="n">fromstring</span><span class="p">(</span> <span class="nb">file</span><span class="p">(</span><span class="n">file2</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="s">'<d'</span><span class="p">)</span>
<span class="n">M2</span> <span class="o">=</span> <span class="n">resize</span><span class="p">(</span><span class="n">M2</span><span class="p">,</span> <span class="p">(</span><span class="n">M2</span><span class="o">.</span><span class="n">shape</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span> <span class="p">)</span>
<span class="n">d1</span><span class="p">,</span> <span class="n">p1</span> <span class="o">=</span> <span class="n">M1</span><span class="p">[:,</span><span class="mi">0</span><span class="p">],</span> <span class="n">M1</span><span class="p">[:,</span><span class="mi">1</span><span class="p">]</span>
<span class="n">d2</span><span class="p">,</span> <span class="n">p2</span> <span class="o">=</span> <span class="n">M2</span><span class="p">[:,</span><span class="mi">0</span><span class="p">],</span> <span class="n">M2</span><span class="p">[:,</span><span class="mi">1</span><span class="p">]</span>
<span class="k">return</span> <span class="p">(</span><span class="n">d1</span><span class="p">,</span><span class="n">p1</span><span class="p">,</span><span class="n">d2</span><span class="p">,</span><span class="n">p2</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">get_daily_data</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> return stock1 and stock2 instances, each of which have attributes</span>
<span class="sd"> open, high, low, close, volume</span>
<span class="sd"> as numeric arrays</span>
<span class="sd"> """</span>
<span class="k">class</span> <span class="nc">C</span><span class="p">:</span> <span class="k">pass</span>
<span class="k">def</span> <span class="nf">get_ticker</span><span class="p">(</span><span class="n">ticker</span><span class="p">):</span>
<span class="n">vals</span> <span class="o">=</span> <span class="p">[]</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">'</span><span class="si">%s</span><span class="s">.csv'</span><span class="o">%</span><span class="n">ticker</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="n">lines</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="o">.</span><span class="n">readlines</span><span class="p">()</span>
<span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">lines</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span>
<span class="n">vals</span><span class="o">.</span><span class="n">append</span><span class="p">([</span><span class="nb">float</span><span class="p">(</span><span class="n">val</span><span class="p">)</span> <span class="k">for</span> <span class="n">val</span> <span class="ow">in</span> <span class="n">line</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">','</span><span class="p">)[</span><span class="mi">1</span><span class="p">:]])</span>
<span class="n">M</span> <span class="o">=</span> <span class="n">array</span><span class="p">(</span><span class="n">vals</span><span class="p">)</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">C</span><span class="p">()</span>
<span class="n">c</span><span class="o">.</span><span class="n">open</span> <span class="o">=</span> <span class="n">M</span><span class="p">[:,</span><span class="mi">0</span><span class="p">]</span>
<span class="n">c</span><span class="o">.</span><span class="n">high</span> <span class="o">=</span> <span class="n">M</span><span class="p">[:,</span><span class="mi">1</span><span class="p">]</span>
<span class="n">c</span><span class="o">.</span><span class="n">low</span> <span class="o">=</span> <span class="n">M</span><span class="p">[:,</span><span class="mi">2</span><span class="p">]</span>
<span class="n">c</span><span class="o">.</span><span class="n">close</span> <span class="o">=</span> <span class="n">M</span><span class="p">[:,</span><span class="mi">3</span><span class="p">]</span>
<span class="n">c</span><span class="o">.</span><span class="n">volume</span> <span class="o">=</span> <span class="n">M</span><span class="p">[:,</span><span class="mi">4</span><span class="p">]</span>
<span class="k">return</span> <span class="n">c</span>
<span class="n">c1</span> <span class="o">=</span> <span class="n">get_ticker</span><span class="p">(</span><span class="s">'intc'</span><span class="p">)</span>
<span class="n">c2</span> <span class="o">=</span> <span class="n">get_ticker</span><span class="p">(</span><span class="s">'msft'</span><span class="p">)</span>
<span class="k">return</span> <span class="n">c1</span><span class="p">,</span> <span class="n">c2</span>
</pre></div>
</div>
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