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              <p class="caption"><span class="caption-text">Setup</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../install.html">How to install the CBD framework?</a></li>
<li class="toctree-l1"><a class="reference internal" href="../running.html">How to run a CBD simulation?</a></li>
<li class="toctree-l1"><a class="reference internal" href="../changelog.html">Changelog</a></li>
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<p class="caption"><span class="caption-text">Simple Examples</span></p>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Sine Generator</a></li>
<li class="toctree-l1"><a class="reference internal" href="EvenNumberGen.html">Hierarchical Even Number Generator</a></li>
<li class="toctree-l1"><a class="reference internal" href="Fibonacci.html">Fibonacci Sequence Generator</a></li>
<li class="toctree-l1"><a class="reference internal" href="LCG.html">Linear Congruential Generator</a></li>
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<p class="caption"><span class="caption-text">Advanced Examples</span></p>
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<li class="toctree-l1"><a class="reference internal" href="RealTime.html">Realtime Simulation</a></li>
<li class="toctree-l1"><a class="reference internal" href="LivePlot.html">Live Plotting of Data During the Simulation</a></li>
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  <div class="section" id="sine-generator">
<h1>Sine Generator<a class="headerlink" href="#sine-generator" title="Permalink to this headline">¶</a></h1>
<p>A very simple example usage of the framework is to create a CBD model
that implements the equation <code class="code docutils literal notranslate"><span class="pre">y</span> <span class="pre">=</span> <span class="pre">sin(t)</span></code>, where <code class="code docutils literal notranslate"><span class="pre">t</span></code> is
the simulation time and <code class="code docutils literal notranslate"><span class="pre">y</span></code> an output signal we’re interested in.</p>
<p>Luckily, the standard library provides some functionalities to help us
solve this problem. Let’s import two blocks:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">CBD.lib.std</span> <span class="kn">import</span> <span class="n">TimeBlock</span><span class="p">,</span> <span class="n">GenericBlock</span>
</pre></div>
</div>
<p>The <a class="reference internal" href="../CBD.lib.std.html#CBD.lib.std.TimeBlock" title="CBD.lib.std.TimeBlock"><code class="xref py py-class docutils literal notranslate"><span class="pre">CBD.lib.std.TimeBlock</span></code></a> will output the current simulation time
every delta timeunits. This block will be used to obtain the <code class="code docutils literal notranslate"><span class="pre">t</span></code>
variable. The <a class="reference internal" href="../CBD.lib.std.html#CBD.lib.std.GenericBlock" title="CBD.lib.std.GenericBlock"><code class="xref py py-class docutils literal notranslate"><span class="pre">CBD.lib.std.GenericBlock</span></code></a> is a generic interface to
Python’s <code class="xref py py-mod docutils literal notranslate"><span class="pre">math</span></code> module. We will use this block to implement the sine
function itself.</p>
<p>Next, we need a container to group these two blocks in. This is done in the
hierarchical <a class="reference internal" href="../CBD.CBD.html#CBD.CBD.CBD" title="CBD.CBD.CBD"><code class="xref py py-class docutils literal notranslate"><span class="pre">CBD.CBD.CBD</span></code></a> class. Let’s call this “grouping” block
<code class="code docutils literal notranslate"><span class="pre">SinGen</span></code> and give it a single output port, named <code class="code docutils literal notranslate"><span class="pre">OUT1</span></code>.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">CBD.CBD</span> <span class="kn">import</span> <span class="n">CBD</span>

<span class="k">class</span> <span class="nc">SinGen</span><span class="p">(</span><span class="n">CBD</span><span class="p">):</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;SinGen&quot;</span><span class="p">):</span>
        <span class="n">CBD</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">input_ports</span><span class="o">=</span><span class="p">[],</span> <span class="n">output_ports</span><span class="o">=</span><span class="p">[</span><span class="s2">&quot;OUT1&quot;</span><span class="p">])</span>

        <span class="c1"># Add the timer block and let&#39;s call it &#39;time&#39;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">addBlock</span><span class="p">(</span><span class="n">TimeBlock</span><span class="p">(</span><span class="s2">&quot;time&quot;</span><span class="p">))</span>

        <span class="c1"># Add the block that computes the actual sine function</span>
        <span class="c1"># Let&#39;s call it &#39;sin&#39;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">addBlock</span><span class="p">(</span><span class="n">GenericBlock</span><span class="p">(</span><span class="s2">&quot;sin&quot;</span><span class="p">,</span> <span class="n">block_operator</span><span class="o">=</span><span class="s2">&quot;sin&quot;</span><span class="p">))</span>

        <span class="c1"># Connect them together</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">addConnection</span><span class="p">(</span><span class="s2">&quot;time&quot;</span><span class="p">,</span> <span class="s2">&quot;sin&quot;</span><span class="p">,</span> <span class="n">output_port_name</span><span class="o">=</span><span class="s1">&#39;OUT1&#39;</span><span class="p">,</span>
                                          <span class="n">input_port_name</span><span class="o">=</span><span class="s1">&#39;IN1&#39;</span><span class="p">)</span>

        <span class="c1"># Connect the output port</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">addConnection</span><span class="p">(</span><span class="s2">&quot;sin&quot;</span><span class="p">,</span> <span class="s2">&quot;OUT1&quot;</span><span class="p">,</span> <span class="n">output_port_name</span><span class="o">=</span><span class="s1">&#39;OUT1&#39;</span><span class="p">)</span>


<span class="n">sinGen</span> <span class="o">=</span> <span class="n">SinGen</span><span class="p">(</span><span class="s2">&quot;SinGen&quot;</span><span class="p">)</span>
</pre></div>
</div>
<p>Notice how this is semantically equivelent to:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">CBD.CBD</span> <span class="kn">import</span> <span class="n">CBD</span>

<span class="n">sinGen</span> <span class="o">=</span> <span class="n">CBD</span><span class="p">(</span><span class="s2">&quot;SinGen&quot;</span><span class="p">,</span> <span class="p">[],</span> <span class="p">[</span><span class="s2">&quot;OUT1&quot;</span><span class="p">])</span>
<span class="n">sinGen</span><span class="o">.</span><span class="n">addBlock</span><span class="p">(</span><span class="n">TimeBlock</span><span class="p">(</span><span class="s2">&quot;time&quot;</span><span class="p">))</span>
<span class="n">sinGen</span><span class="o">.</span><span class="n">addBlock</span><span class="p">(</span><span class="n">GenericBlock</span><span class="p">(</span><span class="s2">&quot;sin&quot;</span><span class="p">,</span> <span class="n">block_operator</span><span class="o">=</span><span class="s2">&quot;sin&quot;</span><span class="p">))</span>
<span class="n">sinGen</span><span class="o">.</span><span class="n">addConnection</span><span class="p">(</span><span class="s2">&quot;time&quot;</span><span class="p">,</span> <span class="s2">&quot;sin&quot;</span><span class="p">,</span> <span class="n">output_port_name</span><span class="o">=</span><span class="s1">&#39;OUT1&#39;</span><span class="p">,</span>
                                    <span class="n">input_port_name</span><span class="o">=</span><span class="s1">&#39;IN1&#39;</span><span class="p">)</span>
<span class="n">sinGen</span><span class="o">.</span><span class="n">addConnection</span><span class="p">(</span><span class="s2">&quot;sin&quot;</span><span class="p">,</span> <span class="s2">&quot;OUT1&quot;</span><span class="p">,</span> <span class="n">output_port_name</span><span class="o">=</span><span class="s1">&#39;OUT1&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>If we now want to simulate our model for 20 seconds (of simulation-time), we can
simply do:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">CBD.simulator</span> <span class="kn">import</span> <span class="n">Simulator</span>

<span class="n">sim</span> <span class="o">=</span> <span class="n">Simulator</span><span class="p">(</span><span class="n">sinGen</span><span class="p">)</span>
<span class="c1"># The termination time can be set as argument to the run call</span>
<span class="n">sim</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="mf">20.0</span><span class="p">)</span>
</pre></div>
</div>
<p>Next, we would like to obtain the accumulated simulation data on the <code class="code docutils literal notranslate"><span class="pre">OUT1</span></code>
output port of the <code class="code docutils literal notranslate"><span class="pre">sinGen</span></code> block, which can be plotted against their iteration
(which is equivalent to the time in this case).</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">data</span> <span class="o">=</span> <span class="n">sinGen</span><span class="o">.</span><span class="n">getSignal</span><span class="p">(</span><span class="s1">&#39;OUT1&#39;</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="p">[</span><span class="n">x</span> <span class="k">for</span> <span class="n">x</span><span class="p">,</span> <span class="n">_</span> <span class="ow">in</span> <span class="n">data</span><span class="p">],</span> <span class="p">[</span><span class="n">y</span> <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">y</span> <span class="ow">in</span> <span class="n">data</span><span class="p">]</span>
</pre></div>
</div>
<div class="figure">
<img alt="../_images/sin-disc.png" src="../_images/sin-disc.png" />
</div>
<p>Now, this is obviously not the sine wave we know and love. This is because our simulator
only computes at 0, 1, 2, 3… seconds, but not in-between. Let’s change that.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">sim</span><span class="o">.</span><span class="n">setDeltaT</span><span class="p">(</span><span class="mf">0.1</span><span class="p">)</span>
</pre></div>
</div>
<p>Now, we interpolate the sine-wave every 10th of a second, which looks much better:</p>
<div class="figure">
<img alt="../_images/sin-cont.png" src="../_images/sin-cont.png" />
</div>
</div>


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