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| <h2 title="Interface FirstOrderDifferentialEquations" class="title">Interface FirstOrderDifferentialEquations</h2> |
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| <pre>public interface <span class="strong">FirstOrderDifferentialEquations</span></pre> |
| <div class="block">This interface represents a first order differential equations set. |
| |
| <p>This interface should be implemented by all real first order |
| differential equation problems before they can be handled by the |
| integrators <a href="../../../../../org/apache/commons/math3/ode/FirstOrderIntegrator.html#integrate(org.apache.commons.math3.ode.FirstOrderDifferentialEquations, double, double[], double, double[])"><code>FirstOrderIntegrator.integrate(org.apache.commons.math3.ode.FirstOrderDifferentialEquations, double, double[], double, double[])</code></a> method.</p> |
| |
| <p>A first order differential equations problem, as seen by an |
| integrator is the time derivative <code>dY/dt</code> of a state |
| vector <code>Y</code>, both being one dimensional arrays. From the |
| integrator point of view, this derivative depends only on the |
| current time <code>t</code> and on the state vector |
| <code>Y</code>.</p> |
| |
| <p>For real problems, the derivative depends also on parameters |
| that do not belong to the state vector (dynamical model constants |
| for example). These constants are completely outside of the scope |
| of this interface, the classes that implement it are allowed to |
| handle them as they want.</p></div> |
| <dl><dt><span class="strong">Since:</span></dt> |
| <dd>1.2</dd> |
| <dt><span class="strong">Version:</span></dt> |
| <dd>$Id: FirstOrderDifferentialEquations.java 1416643 2012-12-03 19:37:14Z tn $</dd> |
| <dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/ode/FirstOrderIntegrator.html" title="interface in org.apache.commons.math3.ode"><code>FirstOrderIntegrator</code></a>, |
| <a href="../../../../../org/apache/commons/math3/ode/FirstOrderConverter.html" title="class in org.apache.commons.math3.ode"><code>FirstOrderConverter</code></a>, |
| <a href="../../../../../org/apache/commons/math3/ode/SecondOrderDifferentialEquations.html" title="interface in org.apache.commons.math3.ode"><code>SecondOrderDifferentialEquations</code></a></dd></dl> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/FirstOrderDifferentialEquations.html#computeDerivatives(double, double[], double[])">computeDerivatives</a></strong>(double t, |
| double[] y, |
| double[] yDot)</code> |
| <div class="block">Get the current time derivative of the state vector.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/FirstOrderDifferentialEquations.html#getDimension()">getDimension</a></strong>()</code> |
| <div class="block">Get the dimension of the problem.</div> |
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| <h4>getDimension</h4> |
| <pre>int getDimension()</pre> |
| <div class="block">Get the dimension of the problem.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>dimension of the problem</dd></dl> |
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| <h4>computeDerivatives</h4> |
| <pre>void computeDerivatives(double t, |
| double[] y, |
| double[] yDot) |
| throws <a href="../../../../../org/apache/commons/math3/exception/MaxCountExceededException.html" title="class in org.apache.commons.math3.exception">MaxCountExceededException</a>, |
| <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre> |
| <div class="block">Get the current time derivative of the state vector.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>t</code> - current value of the independent <I>time</I> variable</dd><dd><code>y</code> - array containing the current value of the state vector</dd><dd><code>yDot</code> - placeholder array where to put the time derivative of the state vector</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/MaxCountExceededException.html" title="class in org.apache.commons.math3.exception">MaxCountExceededException</a></code> - if the number of functions evaluations is exceeded</dd> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if arrays dimensions do not match equations settings</dd></dl> |
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