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| <div class="subTitle">org.apache.mahout.math.jet.stat</div> |
| <h2 title="Class Gamma" class="title">Class Gamma</h2> |
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| <pre>public final class <span class="typeNameLabel">Gamma</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></pre> |
| <div class="block">Partially deprecated until unit tests are in place. Until this time, this class/interface is unsupported.</div> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/jet/stat/Gamma.html#beta-double-double-">beta</a></span>(double alpha, |
| double beta)</code> |
| <div class="block">Returns the beta function of the arguments.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/jet/stat/Gamma.html#gamma-double-">gamma</a></span>(double x)</code> |
| <div class="block">Returns the Gamma function of the argument.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/jet/stat/Gamma.html#incompleteBeta-double-double-double-">incompleteBeta</a></span>(double alpha, |
| double beta, |
| double xx)</code> |
| <div class="block">Returns the regularized Incomplete Beta Function evaluated from zero to <tt>xx</tt>; formerly named <tt>ibeta</tt>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/jet/stat/Gamma.html#incompleteGamma-double-double-">incompleteGamma</a></span>(double alpha, |
| double x)</code> |
| <div class="block">Returns the Incomplete Gamma function; formerly named <tt>igamma</tt>.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/jet/stat/Gamma.html#incompleteGammaComplement-double-double-">incompleteGammaComplement</a></span>(double alpha, |
| double x)</code> |
| <div class="block">Returns the Complemented Incomplete Gamma function; formerly named <tt>igamc</tt>.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/jet/stat/Gamma.html#logGamma-double-">logGamma</a></span>(double x)</code> |
| <div class="block">Returns the natural logarithm of the gamma function; formerly named <tt>lgamma</tt>.</div> |
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| <a name="beta-double-double-"> |
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| <h4>beta</h4> |
| <pre>public static double beta(double alpha, |
| double beta)</pre> |
| <div class="block">Returns the beta function of the arguments. |
| <pre> |
| - - |
| | (a) | (b) |
| beta( a, b ) = -----------. |
| - |
| | (a+b) |
| </pre></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>alpha</code> - </dd> |
| <dd><code>beta</code> - </dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The beta function for given values of alpha and beta.</dd> |
| </dl> |
| </li> |
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| <a name="gamma-double-"> |
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| <h4>gamma</h4> |
| <pre>public static double gamma(double x)</pre> |
| <div class="block">Returns the Gamma function of the argument.</div> |
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| <h4>incompleteBeta</h4> |
| <pre>public static double incompleteBeta(double alpha, |
| double beta, |
| double xx)</pre> |
| <div class="block">Returns the regularized Incomplete Beta Function evaluated from zero to <tt>xx</tt>; formerly named <tt>ibeta</tt>. |
| |
| See http://en.wikipedia.org/wiki/Incomplete_beta_function#Incomplete_beta_function</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>alpha</code> - the alpha parameter of the beta distribution.</dd> |
| <dd><code>beta</code> - the beta parameter of the beta distribution.</dd> |
| <dd><code>xx</code> - the integration end point.</dd> |
| </dl> |
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| <h4>incompleteGamma</h4> |
| <pre>public static double incompleteGamma(double alpha, |
| double x)</pre> |
| <div class="block">Returns the Incomplete Gamma function; formerly named <tt>igamma</tt>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>alpha</code> - the shape parameter of the gamma distribution.</dd> |
| <dd><code>x</code> - the integration end point.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The value of the unnormalized incomplete gamma function.</dd> |
| </dl> |
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| <h4>incompleteGammaComplement</h4> |
| <pre>public static double incompleteGammaComplement(double alpha, |
| double x)</pre> |
| <div class="block">Returns the Complemented Incomplete Gamma function; formerly named <tt>igamc</tt>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>alpha</code> - the shape parameter of the gamma distribution.</dd> |
| <dd><code>x</code> - the integration start point.</dd> |
| </dl> |
| </li> |
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| <h4>logGamma</h4> |
| <pre>public static double logGamma(double x)</pre> |
| <div class="block">Returns the natural logarithm of the gamma function; formerly named <tt>lgamma</tt>.</div> |
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