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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.commons.math3.complex</div>
+<h2 title="Class Quaternion" class="title">Class Quaternion</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.commons.math3.complex.Quaternion</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public final class <span class="strong">Quaternion</span>
+extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
+implements <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre>
+<div class="block">This class implements <a href="http://mathworld.wolfram.com/Quaternion.html">
+ quaternions</a> (Hamilton's hypercomplex numbers).
+ <br/>
+ Instance of this class are guaranteed to be immutable.</div>
+<dl><dt><span class="strong">Since:</span></dt>
+ <dd>3.1</dd>
+<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../serialized-form.html#org.apache.commons.math3.complex.Quaternion">Serialized Form</a></dd></dl>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- =========== FIELD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="field_summary">
+<!-- -->
+</a>
+<h3>Field Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
+<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Field and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#I">I</a></strong></code>
+<div class="block">i</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#IDENTITY">IDENTITY</a></strong></code>
+<div class="block">Identity quaternion.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#J">J</a></strong></code>
+<div class="block">j</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#K">K</a></strong></code>
+<div class="block">k</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#ZERO">ZERO</a></strong></code>
+<div class="block">Zero quaternion.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- ======== CONSTRUCTOR SUMMARY ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor_summary">
+<!-- -->
+</a>
+<h3>Constructor Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
+<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#Quaternion(double[])">Quaternion</a></strong>(double[]&nbsp;v)</code>
+<div class="block">Builds a pure quaternion from a vector (assuming that the scalar
+ part is zero).</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#Quaternion(double,%20double[])">Quaternion</a></strong>(double&nbsp;scalar,
+ double[]&nbsp;v)</code>
+<div class="block">Builds a quaternion from scalar and vector parts.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#Quaternion(double,%20double,%20double,%20double)">Quaternion</a></strong>(double&nbsp;a,
+ double&nbsp;b,
+ double&nbsp;c,
+ double&nbsp;d)</code>
+<div class="block">Builds a quaternion from its components.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method_summary">
+<!-- -->
+</a>
+<h3>Method Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#add(org.apache.commons.math3.complex.Quaternion)">add</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q)</code>
+<div class="block">Computes the sum of the instance and another quaternion.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#add(org.apache.commons.math3.complex.Quaternion,%20org.apache.commons.math3.complex.Quaternion)">add</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q1,
+ <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q2)</code>
+<div class="block">Computes the sum of two quaternions.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#dotProduct(org.apache.commons.math3.complex.Quaternion)">dotProduct</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q)</code>
+<div class="block">Computes the dot-product of the instance by a quaternion.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#dotProduct(org.apache.commons.math3.complex.Quaternion,%20org.apache.commons.math3.complex.Quaternion)">dotProduct</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q1,
+ <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q2)</code>
+<div class="block">Computes the dot-product of two quaternions.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#equals(java.lang.Object)">equals</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;other)</code></td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#equals(org.apache.commons.math3.complex.Quaternion,%20double)">equals</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q,
+ double&nbsp;eps)</code>
+<div class="block">Checks whether this instance is equal to another quaternion
+ within a given tolerance.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getConjugate()">getConjugate</a></strong>()</code>
+<div class="block">Returns the conjugate quaternion of the instance.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getInverse()">getInverse</a></strong>()</code>
+<div class="block">Returns the inverse of this instance.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getNorm()">getNorm</a></strong>()</code>
+<div class="block">Computes the norm of the quaternion.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getPositivePolarForm()">getPositivePolarForm</a></strong>()</code>
+<div class="block">Returns the polar form of the quaternion.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getQ0()">getQ0</a></strong>()</code>
+<div class="block">Gets the first component of the quaternion (scalar part).</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getQ1()">getQ1</a></strong>()</code>
+<div class="block">Gets the second component of the quaternion (first component
+ of the vector part).</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getQ2()">getQ2</a></strong>()</code>
+<div class="block">Gets the third component of the quaternion (second component
+ of the vector part).</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getQ3()">getQ3</a></strong>()</code>
+<div class="block">Gets the fourth component of the quaternion (third component
+ of the vector part).</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getScalarPart()">getScalarPart</a></strong>()</code>
+<div class="block">Gets the scalar part of the quaternion.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>double[]</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#getVectorPart()">getVectorPart</a></strong>()</code>
+<div class="block">Gets the three components of the vector part of the quaternion.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#hashCode()">hashCode</a></strong>()</code></td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#isPureQuaternion(double)">isPureQuaternion</a></strong>(double&nbsp;eps)</code>
+<div class="block">Checks whether the instance is a pure quaternion within a given
+ tolerance.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#isUnitQuaternion(double)">isUnitQuaternion</a></strong>(double&nbsp;eps)</code>
+<div class="block">Checks whether the instance is a unit quaternion within a given
+ tolerance.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#multiply(double)">multiply</a></strong>(double&nbsp;alpha)</code>
+<div class="block">Multiplies the instance by a scalar.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#multiply(org.apache.commons.math3.complex.Quaternion)">multiply</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q)</code>
+<div class="block">Returns the Hamilton product of the instance by a quaternion.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#multiply(org.apache.commons.math3.complex.Quaternion,%20org.apache.commons.math3.complex.Quaternion)">multiply</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q1,
+ <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q2)</code>
+<div class="block">Returns the Hamilton product of two quaternions.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#normalize()">normalize</a></strong>()</code>
+<div class="block">Computes the normalized quaternion (the versor of the instance).</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#subtract(org.apache.commons.math3.complex.Quaternion)">subtract</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q)</code>
+<div class="block">Subtracts a quaternion from the instance.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#subtract(org.apache.commons.math3.complex.Quaternion,%20org.apache.commons.math3.complex.Quaternion)">subtract</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q1,
+ <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q2)</code>
+<div class="block">Subtracts two quaternions.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code><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></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/complex/Quaternion.html#toString()">toString</a></strong>()</code></td>
+</tr>
+</table>
+<ul class="blockList">
+<li class="blockList"><a name="methods_inherited_from_class_java.lang.Object">
+<!-- -->
+</a>
+<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
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+<div class="block">Builds a quaternion from its components.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - Scalar component.</dd><dd><code>b</code> - First vector component.</dd><dd><code>c</code> - Second vector component.</dd><dd><code>d</code> - Third vector component.</dd></dl>
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+<div class="block">Builds a quaternion from scalar and vector parts.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>scalar</code> - Scalar part of the quaternion.</dd><dd><code>v</code> - Components of the vector part of the quaternion.</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 the array length is not 3.</dd></dl>
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+<div class="block">Builds a pure quaternion from a vector (assuming that the scalar
+ part is zero).</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Components of the vector part of the pure quaternion.</dd></dl>
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+<div class="block">Returns the conjugate quaternion of the instance.</div>
+<dl><dt><span class="strong">Returns:</span></dt><dd>the conjugate quaternion</dd></dl>
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+ <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q2)</pre>
+<div class="block">Returns the Hamilton product of two quaternions.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>q1</code> - First quaternion.</dd><dd><code>q2</code> - Second quaternion.</dd>
+<dt><span class="strong">Returns:</span></dt><dd>the product <code>q1</code> and <code>q2</code>, in that order.</dd></dl>
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+<div class="block">Returns the Hamilton product of the instance by a quaternion.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>q</code> - Quaternion.</dd>
+<dt><span class="strong">Returns:</span></dt><dd>the product of this instance with <code>q</code>, in that order.</dd></dl>
+</li>
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+<div class="block">Computes the sum of two quaternions.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>q1</code> - Quaternion.</dd><dd><code>q2</code> - Quaternion.</dd>
+<dt><span class="strong">Returns:</span></dt><dd>the sum of <code>q1</code> and <code>q2</code>.</dd></dl>
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+<div class="block">Computes the sum of the instance and another quaternion.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>q</code> - Quaternion.</dd>
+<dt><span class="strong">Returns:</span></dt><dd>the sum of this instance and <code>q</code></dd></dl>
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+<div class="block">Subtracts two quaternions.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>q1</code> - First Quaternion.</dd><dd><code>q2</code> - Second quaternion.</dd>
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+<div class="block">Subtracts a quaternion from the instance.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>q</code> - Quaternion.</dd>
+<dt><span class="strong">Returns:</span></dt><dd>the difference between this instance and <code>q</code>.</dd></dl>
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+ <a href="../../../../../org/apache/commons/math3/complex/Quaternion.html" title="class in org.apache.commons.math3.complex">Quaternion</a>&nbsp;q2)</pre>
+<div class="block">Computes the dot-product of two quaternions.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>q1</code> - Quaternion.</dd><dd><code>q2</code> - Quaternion.</dd>
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+<div class="block">Computes the dot-product of the instance by a quaternion.</div>
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+<dt><span class="strong">Returns:</span></dt><dd>the dot product of this instance and <code>q</code>.</dd></dl>
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+<div class="block">Computes the normalized quaternion (the versor of the instance).
+ The norm of the quaternion must not be zero.</div>
+<dl><dt><span class="strong">Returns:</span></dt><dd>a normalized quaternion.</dd>
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+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>q</code> - Quaternion with which to compare the current quaternion.</dd><dd><code>eps</code> - Tolerance.</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the each of the components are equal
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+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>eps</code> - Tolerance (absolute error).</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the norm is 1 within the given tolerance,
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+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>eps</code> - Tolerance (absolute error).</dd>
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+<dl><dt><span class="strong">Returns:</span></dt><dd>the third component of the vector part.</dd></dl>
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+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>alpha</code> - Scalar factor.</dd>
+<dt><span class="strong">Returns:</span></dt><dd>a scaled quaternion.</dd></dl>
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+<a name="toString()">
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