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<div class="subTitle">org.apache.commons.math3.ode</div>
<h2 title="Class MultistepFieldIntegrator" class="title">Class MultistepFieldIntegrator<T extends <a href="../../../../../org/apache/commons/math3/RealFieldElement.html" title="interface in org.apache.commons.math3">RealFieldElement</a><T>></h2>
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<ul class="inheritance">
<li><a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html" title="class in org.apache.commons.math3.ode">org.apache.commons.math3.ode.AbstractFieldIntegrator</a><T></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">org.apache.commons.math3.ode.nonstiff.AdaptiveStepsizeFieldIntegrator</a><T></li>
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<li>org.apache.commons.math3.ode.MultistepFieldIntegrator<T></li>
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<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - the type of the field elements</dd></dl>
<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/commons/math3/ode/FirstOrderFieldIntegrator.html" title="interface in org.apache.commons.math3.ode">FirstOrderFieldIntegrator</a><T></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdamsFieldIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">AdamsFieldIntegrator</a></dd>
</dl>
<hr>
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<pre>public abstract class <span class="strong">MultistepFieldIntegrator<T extends <a href="../../../../../org/apache/commons/math3/RealFieldElement.html" title="interface in org.apache.commons.math3">RealFieldElement</a><T>></span>
extends <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">AdaptiveStepsizeFieldIntegrator</a><T></pre>
<div class="block">This class is the base class for multistep integrators for Ordinary
Differential Equations.
<p>We define scaled derivatives s<sub>i</sub>(n) at step n as:
<pre>
s<sub>1</sub>(n) = h y'<sub>n</sub> for first derivative
s<sub>2</sub>(n) = h<sup>2</sup>/2 y''<sub>n</sub> for second derivative
s<sub>3</sub>(n) = h<sup>3</sup>/6 y'''<sub>n</sub> for third derivative
...
s<sub>k</sub>(n) = h<sup>k</sup>/k! y<sup>(k)</sup><sub>n</sub> for k<sup>th</sup> derivative
</pre></p>
<p>Rather than storing several previous steps separately, this implementation uses
the Nordsieck vector with higher degrees scaled derivatives all taken at the same
step (y<sub>n</sub>, s<sub>1</sub>(n) and r<sub>n</sub>) where r<sub>n</sub> is defined as:
<pre>
r<sub>n</sub> = [ s<sub>2</sub>(n), s<sub>3</sub>(n) ... s<sub>k</sub>(n) ]<sup>T</sup>
</pre>
(we omit the k index in the notation for clarity)</p>
<p>
Multistep integrators with Nordsieck representation are highly sensitive to
large step changes because when the step is multiplied by factor a, the
k<sup>th</sup> component of the Nordsieck vector is multiplied by a<sup>k</sup>
and the last components are the least accurate ones. The default max growth
factor is therefore set to a quite low value: 2<sup>1/order</sup>.
</p></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>3.6</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdamsBashforthFieldIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff"><code>AdamsBashforthFieldIntegrator</code></a>,
<a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdamsMoultonFieldIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff"><code>AdamsMoultonFieldIntegrator</code></a></dd></dl>
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<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../../../org/apache/commons/math3/linear/Array2DRowFieldMatrix.html" title="class in org.apache.commons.math3.linear">Array2DRowFieldMatrix</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#nordsieck">nordsieck</a></strong></code>
<div class="block">Nordsieck matrix of the higher scaled derivatives.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#scaled">scaled</a></strong></code>
<div class="block">First scaled derivative (h y').</div>
</td>
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<h3>Fields inherited from class org.apache.commons.math3.ode.nonstiff.<a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">AdaptiveStepsizeFieldIntegrator</a></h3>
<code><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.html#mainSetDimension">mainSetDimension</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.html#scalAbsoluteTolerance">scalAbsoluteTolerance</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.html#scalRelativeTolerance">scalRelativeTolerance</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.html#vecAbsoluteTolerance">vecAbsoluteTolerance</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.html#vecRelativeTolerance">vecRelativeTolerance</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Modifier</th>
<th class="colLast" scope="col">Constructor and Description</th>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#MultistepFieldIntegrator(org.apache.commons.math3.Field,%20java.lang.String,%20int,%20int,%20double,%20double,%20double[],%20double[])">MultistepFieldIntegrator</a></strong>(<a href="../../../../../org/apache/commons/math3/Field.html" title="interface in org.apache.commons.math3">Field</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> field,
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name,
int nSteps,
int order,
double minStep,
double maxStep,
double[] vecAbsoluteTolerance,
double[] vecRelativeTolerance)</code>
<div class="block">Build a multistep integrator with the given stepsize bounds.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#MultistepFieldIntegrator(org.apache.commons.math3.Field,%20java.lang.String,%20int,%20int,%20double,%20double,%20double,%20double)">MultistepFieldIntegrator</a></strong>(<a href="../../../../../org/apache/commons/math3/Field.html" title="interface in org.apache.commons.math3">Field</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> field,
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name,
int nSteps,
int order,
double minStep,
double maxStep,
double scalAbsoluteTolerance,
double scalRelativeTolerance)</code>
<div class="block">Build a multistep integrator with the given stepsize bounds.</div>
</td>
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<td class="colFirst"><code>protected <a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#computeStepGrowShrinkFactor(T)">computeStepGrowShrinkFactor</a></strong>(<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> error)</code>
<div class="block">Compute step grow/shrink factor according to normalized error.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#getMaxGrowth()">getMaxGrowth</a></strong>()</code>
<div class="block">Get the maximal growth factor for stepsize control.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#getMinReduction()">getMinReduction</a></strong>()</code>
<div class="block">Get the minimal reduction factor for stepsize control.</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/MultistepFieldIntegrator.html#getNSteps()">getNSteps</a></strong>()</code>
<div class="block">Get the number of steps of the multistep method (excluding the one being computed).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#getSafety()">getSafety</a></strong>()</code>
<div class="block">Get the safety factor for stepsize control.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/ode/FirstOrderFieldIntegrator.html" title="interface in org.apache.commons.math3.ode">FirstOrderFieldIntegrator</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#getStarterIntegrator()">getStarterIntegrator</a></strong>()</code>
<div class="block">Get the starter integrator.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected abstract <a href="../../../../../org/apache/commons/math3/linear/Array2DRowFieldMatrix.html" title="class in org.apache.commons.math3.linear">Array2DRowFieldMatrix</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#initializeHighOrderDerivatives(T,%20T[],%20T[][],%20T[][])">initializeHighOrderDerivatives</a></strong>(<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> h,
<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>[] t,
<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>[][] y,
<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>[][] yDot)</code>
<div class="block">Initialize the high order scaled derivatives at step start.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#rescale(T)">rescale</a></strong>(<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> newStepSize)</code>
<div class="block">Rescale the instance.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#setMaxGrowth(double)">setMaxGrowth</a></strong>(double maxGrowth)</code>
<div class="block">Set the maximal growth factor for stepsize control.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#setMinReduction(double)">setMinReduction</a></strong>(double minReduction)</code>
<div class="block">Set the minimal reduction factor for stepsize control.</div>
</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#setSafety(double)">setSafety</a></strong>(double safety)</code>
<div class="block">Set the safety factor for stepsize control.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#setStarterIntegrator(org.apache.commons.math3.ode.FirstOrderFieldIntegrator)">setStarterIntegrator</a></strong>(<a href="../../../../../org/apache/commons/math3/ode/FirstOrderFieldIntegrator.html" title="interface in org.apache.commons.math3.ode">FirstOrderFieldIntegrator</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> starterIntegrator)</code>
<div class="block">Set the starter integrator.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html#start(org.apache.commons.math3.ode.FieldExpandableODE,%20org.apache.commons.math3.ode.FieldODEState,%20T)">start</a></strong>(<a href="../../../../../org/apache/commons/math3/ode/FieldExpandableODE.html" title="class in org.apache.commons.math3.ode">FieldExpandableODE</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> equations,
<a href="../../../../../org/apache/commons/math3/ode/FieldODEState.html" title="class in org.apache.commons.math3.ode">FieldODEState</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> initialState,
<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> t)</code>
<div class="block">Start the integration.</div>
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<code><a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#acceptStep(org.apache.commons.math3.ode.sampling.AbstractFieldStepInterpolator,%20T)">acceptStep</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#addEventHandler(org.apache.commons.math3.ode.events.FieldEventHandler,%20double,%20double,%20int)">addEventHandler</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#addEventHandler(org.apache.commons.math3.ode.events.FieldEventHandler,%20double,%20double,%20int,%20org.apache.commons.math3.analysis.solvers.BracketedRealFieldUnivariateSolver)">addEventHandler</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#addStepHandler(org.apache.commons.math3.ode.sampling.FieldStepHandler)">addStepHandler</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#clearEventHandlers()">clearEventHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#clearStepHandlers()">clearStepHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#computeDerivatives(T,%20T[])">computeDerivatives</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getCurrentSignedStepsize()">getCurrentSignedStepsize</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getCurrentStepStart()">getCurrentStepStart</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getEquations()">getEquations</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getEvaluations()">getEvaluations</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getEvaluationsCounter()">getEvaluationsCounter</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getEventHandlers()">getEventHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getField()">getField</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getMaxEvaluations()">getMaxEvaluations</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getName()">getName</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getStepHandlers()">getStepHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getStepSize()">getStepSize</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#getStepStart()">getStepStart</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#initIntegration(org.apache.commons.math3.ode.FieldExpandableODE,%20T,%20T[],%20T)">initIntegration</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#isLastStep()">isLastStep</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#resetOccurred()">resetOccurred</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#setIsLastStep(boolean)">setIsLastStep</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#setMaxEvaluations(int)">setMaxEvaluations</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#setStateInitialized(boolean)">setStateInitialized</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#setStepSize(T)">setStepSize</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractFieldIntegrator.html#setStepStart(org.apache.commons.math3.ode.FieldODEStateAndDerivative)">setStepStart</a></code></li>
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<code><a href="../../../../../org/apache/commons/math3/ode/FirstOrderFieldIntegrator.html#integrate(org.apache.commons.math3.ode.FieldExpandableODE,%20org.apache.commons.math3.ode.FieldODEState,%20T)">integrate</a></code></li>
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<h4>scaled</h4>
<pre>protected <a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> extends <a href="../../../../../org/apache/commons/math3/RealFieldElement.html" title="interface in org.apache.commons.math3">RealFieldElement</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>>[] scaled</pre>
<div class="block">First scaled derivative (h y').</div>
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<h4>nordsieck</h4>
<pre>protected <a href="../../../../../org/apache/commons/math3/linear/Array2DRowFieldMatrix.html" title="class in org.apache.commons.math3.linear">Array2DRowFieldMatrix</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> extends <a href="../../../../../org/apache/commons/math3/RealFieldElement.html" title="interface in org.apache.commons.math3">RealFieldElement</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>>> nordsieck</pre>
<div class="block">Nordsieck matrix of the higher scaled derivatives.
<p>(h<sup>2</sup>/2 y'', h<sup>3</sup>/6 y''' ..., h<sup>k</sup>/k! y<sup>(k)</sup>)</p></div>
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<pre>protected MultistepFieldIntegrator(<a href="../../../../../org/apache/commons/math3/Field.html" title="interface in org.apache.commons.math3">Field</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> field,
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name,
int nSteps,
int order,
double minStep,
double maxStep,
double scalAbsoluteTolerance,
double scalRelativeTolerance)
throws <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></pre>
<div class="block">Build a multistep integrator with the given stepsize bounds.
<p>The default starter integrator is set to the <a href="../../../../../org/apache/commons/math3/ode/nonstiff/DormandPrince853FieldIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff"><code>Dormand-Prince 8(5,3)</code></a> integrator with
some defaults settings.</p>
<p>
The default max growth factor is set to a quite low value: 2<sup>1/order</sup>.
</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>field</code> - field to which the time and state vector elements belong</dd><dd><code>name</code> - name of the method</dd><dd><code>nSteps</code> - number of steps of the multistep method
(excluding the one being computed)</dd><dd><code>order</code> - order of the method</dd><dd><code>minStep</code> - minimal step (must be positive even for backward
integration), the last step can be smaller than this</dd><dd><code>maxStep</code> - maximal step (must be positive even for backward
integration)</dd><dd><code>scalAbsoluteTolerance</code> - allowed absolute error</dd><dd><code>scalRelativeTolerance</code> - allowed relative error</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if number of steps is smaller than 2</dd></dl>
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<pre>protected MultistepFieldIntegrator(<a href="../../../../../org/apache/commons/math3/Field.html" title="interface in org.apache.commons.math3">Field</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> field,
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name,
int nSteps,
int order,
double minStep,
double maxStep,
double[] vecAbsoluteTolerance,
double[] vecRelativeTolerance)</pre>
<div class="block">Build a multistep integrator with the given stepsize bounds.
<p>The default starter integrator is set to the <a href="../../../../../org/apache/commons/math3/ode/nonstiff/DormandPrince853FieldIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff"><code>Dormand-Prince 8(5,3)</code></a> integrator with
some defaults settings.</p>
<p>
The default max growth factor is set to a quite low value: 2<sup>1/order</sup>.
</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>field</code> - field to which the time and state vector elements belong</dd><dd><code>name</code> - name of the method</dd><dd><code>nSteps</code> - number of steps of the multistep method
(excluding the one being computed)</dd><dd><code>order</code> - order of the method</dd><dd><code>minStep</code> - minimal step (must be positive even for backward
integration), the last step can be smaller than this</dd><dd><code>maxStep</code> - maximal step (must be positive even for backward
integration)</dd><dd><code>vecAbsoluteTolerance</code> - allowed absolute error</dd><dd><code>vecRelativeTolerance</code> - allowed relative error</dd></dl>
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<pre>public <a href="../../../../../org/apache/commons/math3/ode/FirstOrderFieldIntegrator.html" title="interface in org.apache.commons.math3.ode">FirstOrderFieldIntegrator</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> getStarterIntegrator()</pre>
<div class="block">Get the starter integrator.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>starter integrator</dd></dl>
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<pre>public void setStarterIntegrator(<a href="../../../../../org/apache/commons/math3/ode/FirstOrderFieldIntegrator.html" title="interface in org.apache.commons.math3.ode">FirstOrderFieldIntegrator</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> starterIntegrator)</pre>
<div class="block">Set the starter integrator.
<p>The various step and event handlers for this starter integrator
will be managed automatically by the multi-step integrator. Any
user configuration for these elements will be cleared before use.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>starterIntegrator</code> - starter integrator</dd></dl>
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<pre>protected void start(<a href="../../../../../org/apache/commons/math3/ode/FieldExpandableODE.html" title="class in org.apache.commons.math3.ode">FieldExpandableODE</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> equations,
<a href="../../../../../org/apache/commons/math3/ode/FieldODEState.html" title="class in org.apache.commons.math3.ode">FieldODEState</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> initialState,
<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> t)
throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a>,
<a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a>,
<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/NoBracketingException.html" title="class in org.apache.commons.math3.exception">NoBracketingException</a></pre>
<div class="block">Start the integration.
<p>This method computes one step using the underlying starter integrator,
and initializes the Nordsieck vector at step start. The starter integrator
purpose is only to establish initial conditions, it does not really change
time by itself. The top level multistep integrator remains in charge of
handling time propagation and events handling as it will starts its own
computation right from the beginning. In a sense, the starter integrator
can be seen as a dummy one and so it will never trigger any user event nor
call any user step handler.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>equations</code> - complete set of differential equations to integrate</dd><dd><code>initialState</code> - initial state (time, primary and secondary state vectors)</dd><dd><code>t</code> - target time for the integration
(can be set to a value smaller than <code>t0</code> for backward integration)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if arrays dimension do not match equations settings</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if integration step is too small</dd>
<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/NoBracketingException.html" title="class in org.apache.commons.math3.exception">NoBracketingException</a></code> - if the location of an event cannot be bracketed</dd></dl>
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<pre>protected abstract <a href="../../../../../org/apache/commons/math3/linear/Array2DRowFieldMatrix.html" title="class in org.apache.commons.math3.linear">Array2DRowFieldMatrix</a><<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>> initializeHighOrderDerivatives(<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> h,
<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>[] t,
<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>[][] y,
<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a>[][] yDot)</pre>
<div class="block">Initialize the high order scaled derivatives at step start.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>h</code> - step size to use for scaling</dd><dd><code>t</code> - first steps times</dd><dd><code>y</code> - first steps states</dd><dd><code>yDot</code> - first steps derivatives</dd>
<dt><span class="strong">Returns:</span></dt><dd>Nordieck vector at first step (h<sup>2</sup>/2 y''<sub>n</sub>,
h<sup>3</sup>/6 y'''<sub>n</sub> ... h<sup>k</sup>/k! y<sup>(k)</sup><sub>n</sub>)</dd></dl>
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<pre>public double getMinReduction()</pre>
<div class="block">Get the minimal reduction factor for stepsize control.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>minimal reduction factor</dd></dl>
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<pre>public void setMinReduction(double minReduction)</pre>
<div class="block">Set the minimal reduction factor for stepsize control.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>minReduction</code> - minimal reduction factor</dd></dl>
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<h4>getMaxGrowth</h4>
<pre>public double getMaxGrowth()</pre>
<div class="block">Get the maximal growth factor for stepsize control.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>maximal growth factor</dd></dl>
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<h4>setMaxGrowth</h4>
<pre>public void setMaxGrowth(double maxGrowth)</pre>
<div class="block">Set the maximal growth factor for stepsize control.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>maxGrowth</code> - maximal growth factor</dd></dl>
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<h4>getSafety</h4>
<pre>public double getSafety()</pre>
<div class="block">Get the safety factor for stepsize control.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>safety factor</dd></dl>
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<h4>setSafety</h4>
<pre>public void setSafety(double safety)</pre>
<div class="block">Set the safety factor for stepsize control.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>safety</code> - safety factor</dd></dl>
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<pre>public int getNSteps()</pre>
<div class="block">Get the number of steps of the multistep method (excluding the one being computed).</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>number of steps of the multistep method (excluding the one being computed)</dd></dl>
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<pre>protected void rescale(<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> newStepSize)</pre>
<div class="block">Rescale the instance.
<p>Since the scaled and Nordsieck arrays are shared with the caller,
this method has the side effect of rescaling this arrays in the caller too.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>newStepSize</code> - new step size to use in the scaled and Nordsieck arrays</dd></dl>
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<pre>protected <a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> computeStepGrowShrinkFactor(<a href="../../../../../org/apache/commons/math3/ode/MultistepFieldIntegrator.html" title="type parameter in MultistepFieldIntegrator">T</a> error)</pre>
<div class="block">Compute step grow/shrink factor according to normalized error.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>error</code> - normalized error of the current step</dd>
<dt><span class="strong">Returns:</span></dt><dd>grow/shrink factor for next step</dd></dl>
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