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+<div class="header">
+<div class="subTitle">org.apache.commons.math3.util</div>
+<h2 title="Interface DoubleArray" class="title">Interface DoubleArray</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Known Implementing Classes:</dt>
+<dd><a href="../../../../../org/apache/commons/math3/util/ResizableDoubleArray.html" title="class in org.apache.commons.math3.util">ResizableDoubleArray</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public interface <span class="strong">DoubleArray</span></pre>
+<div class="block">Provides a standard interface for double arrays. Allows different
+ array implementations to support various storage mechanisms
+ such as automatic expansion, contraction, and array "rolling".</div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========== 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>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/DoubleArray.html#addElement(double)">addElement</a></strong>(double&nbsp;value)</code>
+<div class="block">Adds an element to the end of this expandable array</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/DoubleArray.html#addElementRolling(double)">addElementRolling</a></strong>(double&nbsp;value)</code>
+<div class="block">
+ Adds an element to the end of the array and removes the first
+ element in the array.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/DoubleArray.html#addElements(double[])">addElements</a></strong>(double[]&nbsp;values)</code>
+<div class="block">Adds elements to the end of this expandable array</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/DoubleArray.html#clear()">clear</a></strong>()</code>
+<div class="block">Clear the double array</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/DoubleArray.html#getElement(int)">getElement</a></strong>(int&nbsp;index)</code>
+<div class="block">Returns the element at the specified index.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>double[]</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/DoubleArray.html#getElements()">getElements</a></strong>()</code>
+<div class="block">Returns a double[] array containing the elements of this
+ <code>DoubleArray</code>.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/DoubleArray.html#getNumElements()">getNumElements</a></strong>()</code>
+<div class="block">Returns the number of elements currently in the array.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/DoubleArray.html#setElement(int,%20double)">setElement</a></strong>(int&nbsp;index,
+ double&nbsp;value)</code>
+<div class="block">Sets the element at the specified index.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method_detail">
+<!-- -->
+</a>
+<h3>Method Detail</h3>
+<a name="getNumElements()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getNumElements</h4>
+<pre>int&nbsp;getNumElements()</pre>
+<div class="block">Returns the number of elements currently in the array. Please note
+ that this may be different from the length of the internal storage array.</div>
+<dl><dt><span class="strong">Returns:</span></dt><dd>number of elements</dd></dl>
+</li>
+</ul>
+<a name="getElement(int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getElement</h4>
+<pre>double&nbsp;getElement(int&nbsp;index)</pre>
+<div class="block">Returns the element at the specified index. Note that if an
+ out of bounds index is supplied a ArrayIndexOutOfBoundsException
+ will be thrown.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - index to fetch a value from</dd>
+<dt><span class="strong">Returns:</span></dt><dd>value stored at the specified index</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/ArrayIndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">ArrayIndexOutOfBoundsException</a></code> - if <code>index</code> is less than
+ zero or is greater than <code>getNumElements() - 1</code>.</dd></dl>
+</li>
+</ul>
+<a name="setElement(int, double)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>setElement</h4>
+<pre>void&nbsp;setElement(int&nbsp;index,
+ double&nbsp;value)</pre>
+<div class="block">Sets the element at the specified index. If the specified index is greater than
+ <code>getNumElements() - 1</code>, the <code>numElements</code> property
+ is increased to <code>index +1</code> and additional storage is allocated
+ (if necessary) for the new element and all (uninitialized) elements
+ between the new element and the previous end of the array).</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - index to store a value in</dd><dd><code>value</code> - value to store at the specified index</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/ArrayIndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">ArrayIndexOutOfBoundsException</a></code> - if <code>index</code> is less than
+ zero.</dd></dl>
+</li>
+</ul>
+<a name="addElement(double)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>addElement</h4>
+<pre>void&nbsp;addElement(double&nbsp;value)</pre>
+<div class="block">Adds an element to the end of this expandable array</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>value</code> - to be added to end of array</dd></dl>
+</li>
+</ul>
+<a name="addElements(double[])">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>addElements</h4>
+<pre>void&nbsp;addElements(double[]&nbsp;values)</pre>
+<div class="block">Adds elements to the end of this expandable array</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>values</code> - to be added to end of array</dd></dl>
+</li>
+</ul>
+<a name="addElementRolling(double)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>addElementRolling</h4>
+<pre>double&nbsp;addElementRolling(double&nbsp;value)</pre>
+<div class="block"><p>
+ Adds an element to the end of the array and removes the first
+ element in the array. Returns the discarded first element.
+ The effect is similar to a push operation in a FIFO queue.
+ </p>
+ <p>
+ Example: If the array contains the elements 1, 2, 3, 4 (in that order)
+ and addElementRolling(5) is invoked, the result is an array containing
+ the entries 2, 3, 4, 5 and the value returned is 1.
+ </p></div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>value</code> - the value to be added to the array</dd>
+<dt><span class="strong">Returns:</span></dt><dd>the value which has been discarded or "pushed" out of the array
+ by this rolling insert</dd></dl>
+</li>
+</ul>
+<a name="getElements()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getElements</h4>
+<pre>double[]&nbsp;getElements()</pre>
+<div class="block">Returns a double[] array containing the elements of this
+ <code>DoubleArray</code>. If the underlying implementation is
+ array-based, this method should always return a copy, rather than a
+ reference to the underlying array so that changes made to the returned
+ array have no effect on the <code>DoubleArray.</code></div>
+<dl><dt><span class="strong">Returns:</span></dt><dd>all elements added to the array</dd></dl>
+</li>
+</ul>
+<a name="clear()">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>clear</h4>
+<pre>void&nbsp;clear()</pre>
+<div class="block">Clear the double array</div>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
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+<li class="navBarCell1Rev">Class</li>
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