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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.google.android.exoplayer2.util</a></div>
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<h2 title="Class SlidingPercentile" class="title">Class SlidingPercentile</h2>
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<pre>public class <span class="typeNameLabel">SlidingPercentile</span>
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extends <a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></pre>
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<div class="block">Calculate any percentile over a sliding window of weighted values. A maximum weight is
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configured. Once the total weight of the values reaches the maximum weight, the oldest value is
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reduced in weight until it reaches zero and is removed. This maintains a constant total weight,
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equal to the maximum allowed, at the steady state.
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<p>This class can be used for bandwidth estimation based on a sliding window of past transfer
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rate observations. This is an alternative to sliding mean and exponential averaging which suffer
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<dl>
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<dd><a href="http://en.wikipedia.org/wiki/Moving_average">Wiki: Moving average</a>,
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<a href="http://en.wikipedia.org/wiki/Selection_algorithm">Wiki: Selection algorithm</a></dd>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(int)">SlidingPercentile</a></span>​(int maxWeight)</code></th>
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<td class="colLast"> </td>
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#addSample(int,float)">addSample</a></span>​(int weight,
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float value)</code></th>
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<td class="colLast">
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<div class="block">Adds a new weighted value.</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>float</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getPercentile(float)">getPercentile</a></span>​(float percentile)</code></th>
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<td class="colLast">
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<div class="block">Computes a percentile by integration.</div>
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</td>
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</tr>
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#reset()">reset</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Resets the sliding percentile.</div>
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<code><a href="https://developer.android.com/reference/java/lang/Object.html#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink" target="_top">wait</a></code></li>
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<h4>SlidingPercentile</h4>
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<pre>public SlidingPercentile​(int maxWeight)</pre>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>maxWeight</code> - The maximum weight.</dd>
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<h4>reset</h4>
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<pre class="methodSignature">public void reset()</pre>
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<div class="block">Resets the sliding percentile.</div>
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</li>
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<a id="addSample(int,float)">
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<h4>addSample</h4>
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<pre class="methodSignature">public void addSample​(int weight,
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float value)</pre>
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<div class="block">Adds a new weighted value.</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>weight</code> - The weight of the new observation.</dd>
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<dd><code>value</code> - The value of the new observation.</dd>
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</dl>
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<h4>getPercentile</h4>
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<pre class="methodSignature">public float getPercentile​(float percentile)</pre>
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<div class="block">Computes a percentile by integration.</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>percentile</code> - The desired percentile, expressed as a fraction in the range (0,1].</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>The requested percentile value or <a href="https://developer.android.com/reference/java/lang/Float.html#NaN" title="class or interface in java.lang" class="externalLink" target="_top"><code>Float.NaN</code></a> if no samples have been added.</dd>
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