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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>Observer</title>
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<link rel="stylesheet" href="../../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../../index.html" title="Chapter 1. boost.sandbox.numeric.odeint">
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<link rel="up" href="../concepts.html" title="Concepts">
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<link rel="prev" href="implicit_system.html" title="Implicit System">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"></td></tr></table>
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<a accesskey="p" href="implicit_system.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="stepper.html"><img src="../../images/next.png" alt="Next"></a>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_sandbox_numeric_odeint.concepts.observer"></a><a class="link" href="observer.html" title="Observer">Observer</a>
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</h3></div></div></div>
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<h5>
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<a name="boost_sandbox_numeric_odeint.concepts.observer.h0"></a>
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<span><a name="boost_sandbox_numeric_odeint.concepts.observer.description"></a></span><a class="link" href="observer.html#boost_sandbox_numeric_odeint.concepts.observer.description">Description</a>
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</h5>
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<p>
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The Observer concept is used in <code class="computeroutput"><span class="identifier">integrate</span></code>
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routines to allow the user to analyze the state during the subsequent steps.
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Observers are callable objects with a specific parameter pattern as shown
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below. Provided to an <code class="computeroutput"><span class="identifier">integrate</span></code>
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function, observers are called at each time step, at equidistant time points
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or at user defined time points depending on which <code class="computeroutput"><span class="identifier">integrate</span></code>
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function is used.
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</p>
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<h5>
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<a name="boost_sandbox_numeric_odeint.concepts.observer.h1"></a>
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<span><a name="boost_sandbox_numeric_odeint.concepts.observer.notation"></a></span><a class="link" href="observer.html#boost_sandbox_numeric_odeint.concepts.observer.notation">Notation</a>
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</h5>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">Observer</span></code></span></dt>
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<dd><p>
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A type that is a model of Observer
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">State</span></code></span></dt>
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<dd><p>
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A type that is the <code class="computeroutput"><span class="identifier">state_type</span></code>
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">Time</span></code></span></dt>
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<dd><p>
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A type that is the <code class="computeroutput"><span class="identifier">time_type</span></code>
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">obs</span></code></span></dt>
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<dd><p>
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An object that models <code class="computeroutput"><span class="identifier">System</span></code>
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">x</span></code></span></dt>
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<dd><p>
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Object of type <code class="computeroutput"><span class="identifier">State</span></code>
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">t</span></code></span></dt>
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<dd><p>
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Object of type <code class="computeroutput"><span class="identifier">Time</span></code>
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</p></dd>
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</dl>
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</div>
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<h5>
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<a name="boost_sandbox_numeric_odeint.concepts.observer.h2"></a>
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<span><a name="boost_sandbox_numeric_odeint.concepts.observer.valid_expressions"></a></span><a class="link" href="observer.html#boost_sandbox_numeric_odeint.concepts.observer.valid_expressions">Valid
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Expressions</a>
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</h5>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Name
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</p>
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</th>
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<th>
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<p>
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Expression
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</p>
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</th>
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<th>
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<p>
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Type
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</p>
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</th>
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<th>
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<p>
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Semantics
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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Perform the observation
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">obs</span><span class="special">(</span>
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<span class="identifier">x</span> <span class="special">,</span>
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<span class="identifier">t</span> <span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="keyword">void</span></code>
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</p>
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</td>
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<td>
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<p>
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Calls the observer which can do some analysis or output of the
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state <span class="emphasis"><em>x</em></span> at time <span class="emphasis"><em>t</em></span>.
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</p>
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</td>
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</tr></tbody>
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</table></div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2009-2011 Karsten Ahnert
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and Mario Mulansky<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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