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<h2 title="Class Arithmetic" class="title">Class Arithmetic</h2>
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<pre>public final class <span class="typeNameLabel">Arithmetic</span>
extends <a href="../../../../org/apache/mahout/collections/Constants.html" title="class in org.apache.mahout.collections">Constants</a></pre>
<div class="block">Arithmetic functions.</div>
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<code><a href="../../../../org/apache/mahout/collections/Constants.html#BIG">BIG</a>, <a href="../../../../org/apache/mahout/collections/Constants.html#BIGINV">BIGINV</a>, <a href="../../../../org/apache/mahout/collections/Constants.html#LOGPI">LOGPI</a>, <a href="../../../../org/apache/mahout/collections/Constants.html#MACHEP">MACHEP</a>, <a href="../../../../org/apache/mahout/collections/Constants.html#MAXGAM">MAXGAM</a>, <a href="../../../../org/apache/mahout/collections/Constants.html#MAXLOG">MAXLOG</a>, <a href="../../../../org/apache/mahout/collections/Constants.html#MINLOG">MINLOG</a>, <a href="../../../../org/apache/mahout/collections/Constants.html#SQRTH">SQRTH</a>, <a href="../../../../org/apache/mahout/collections/Constants.html#SQTPI">SQTPI</a></code></li>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#binomial-double-long-">binomial</a></span>(double&nbsp;n,
long&nbsp;k)</code>
<div class="block">Efficiently returns the binomial coefficient, often also referred to as
"n over k" or "n choose k".</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#binomial-long-long-">binomial</a></span>(long&nbsp;n,
long&nbsp;k)</code>
<div class="block">Efficiently returns the binomial coefficient, often also referred to as "n over k" or "n choose k".</div>
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<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#ceil-double-">ceil</a></span>(double&nbsp;value)</code>
<div class="block">Returns the smallest <code>long &gt;= value</code>.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#chbevl-double-double:A-int-">chbevl</a></span>(double&nbsp;x,
double[]&nbsp;coef,
int&nbsp;N)</code>
<div class="block">Evaluates the series of Chebyshev polynomials Ti at argument x/2.</div>
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<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#floor-double-">floor</a></span>(double&nbsp;value)</code>
<div class="block">Returns the largest <code>long &lt;= value</code>.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#log-double-double-">log</a></span>(double&nbsp;base,
double&nbsp;value)</code>
<div class="block">Returns <tt>log<sub>base</sub>value</tt>.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#log10-double-">log10</a></span>(double&nbsp;value)</code>
<div class="block">Returns <tt>log<sub>10</sub>value</tt>.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#log2-double-">log2</a></span>(double&nbsp;value)</code>
<div class="block">Returns <tt>log<sub>2</sub>value</tt>.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#logFactorial-int-">logFactorial</a></span>(int&nbsp;k)</code>
<div class="block">Returns <tt>log(k!)</tt>.</div>
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<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#longFactorial-int-">longFactorial</a></span>(int&nbsp;k)</code>
<div class="block">Instantly returns the factorial <tt>k!</tt>.</div>
</td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/collections/Arithmetic.html#stirlingCorrection-int-">stirlingCorrection</a></span>(int&nbsp;k)</code>
<div class="block">Returns the StirlingCorrection.</div>
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<h4>binomial</h4>
<pre>public static&nbsp;double&nbsp;binomial(double&nbsp;n,
long&nbsp;k)</pre>
<div class="block">Efficiently returns the binomial coefficient, often also referred to as
"n over k" or "n choose k". The binomial coefficient is defined as
<tt>(n * n-1 * ... * n-k+1 ) / ( 1 * 2 * ... * k )</tt>.
<ul> <li><tt>k&lt;0</tt>: <tt>0</tt>.</li>
<li><tt>k==0</tt>: <tt>1</tt>.</li>
<li><tt>k==1</tt>: <tt>n</tt>.</li>
<li>else: <tt>(n * n-1 * ... * n-k+1 ) / ( 1 * 2 * ... * k)</tt>.</li>
</ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>n</code> - </dd>
<dd><code>k</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the binomial coefficient.</dd>
</dl>
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<h4>binomial</h4>
<pre>public static&nbsp;double&nbsp;binomial(long&nbsp;n,
long&nbsp;k)</pre>
<div class="block">Efficiently returns the binomial coefficient, often also referred to as "n over k" or "n choose k". The binomial
coefficient is defined as <ul> <li><tt>k&lt;0</tt>: <tt>0</tt>. <li><tt>k==0 || k==n</tt>: <tt>1</tt>. <li><tt>k==1 || k==n-1</tt>:
<tt>n</tt>. <li>else: <tt>(n * n-1 * ... * n-k+1 ) / ( 1 * 2 * ... * k )</tt>. </ul></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the binomial coefficient.</dd>
</dl>
</li>
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<h4>ceil</h4>
<pre>public static&nbsp;long&nbsp;ceil(double&nbsp;value)</pre>
<div class="block">Returns the smallest <code>long &gt;= value</code>.
<dl><dt>Examples: <code>1.0 -&gt; 1, 1.2 -&gt; 2, 1.9 -&gt; 2</code>. This
method is safer than using (long) Math.ceil(value), because of possible rounding error.</dt></dl></div>
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<h4>chbevl</h4>
<pre>public static&nbsp;double&nbsp;chbevl(double&nbsp;x,
double[]&nbsp;coef,
int&nbsp;N)</pre>
<div class="block">Evaluates the series of Chebyshev polynomials Ti at argument x/2. The series is given by
<pre>
N-1
- '
y = &gt; coef[i] T (x/2)
- i
i=0
</pre>
Coefficients are stored in reverse order, i.e. the zero order term is last in the array. Note N is the number of
coefficients, not the order. <p> If coefficients are for the interval a to b, x must have been transformed to x -&lt;
2(2x - b - a)/(b-a) before entering the routine. This maps x from (a, b) to (-1, 1), over which the Chebyshev
polynomials are defined. <p> If the coefficients are for the inverted interval, in which (a, b) is mapped to (1/b,
1/a), the transformation required is <code>x -&gt; 2(2ab/x - b - a)/(b-a)</code>. If b is infinity, this becomes <code>x -&gt; 4a/x - 1</code>.
<p> SPEED: <p> Taking advantage of the recurrence properties of the Chebyshev polynomials, the routine requires one
more addition per loop than evaluating a nested polynomial of the same degree.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>x</code> - argument to the polynomial.</dd>
<dd><code>coef</code> - the coefficients of the polynomial.</dd>
<dd><code>N</code> - the number of coefficients.</dd>
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<h4>floor</h4>
<pre>public static&nbsp;long&nbsp;floor(double&nbsp;value)</pre>
<div class="block">Returns the largest <code>long &lt;= value</code>.
<dl><dt>Examples: <code>1.0 -&gt; 1, 1.2 -&gt; 1, 1.9 -&gt; 1 &lt;dt&gt; 2.0 -&gt; 2, 2.2 -&gt; 2, 2.9 -&gt; 2</code></dt></dl>
This method is safer than using (long) Math.floor(value), because of possible rounding error.</div>
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<h4>log</h4>
<pre>public static&nbsp;double&nbsp;log(double&nbsp;base,
double&nbsp;value)</pre>
<div class="block">Returns <tt>log<sub>base</sub>value</tt>.</div>
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<h4>log10</h4>
<pre>public static&nbsp;double&nbsp;log10(double&nbsp;value)</pre>
<div class="block">Returns <tt>log<sub>10</sub>value</tt>.</div>
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<h4>log2</h4>
<pre>public static&nbsp;double&nbsp;log2(double&nbsp;value)</pre>
<div class="block">Returns <tt>log<sub>2</sub>value</tt>.</div>
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<h4>logFactorial</h4>
<pre>public static&nbsp;double&nbsp;logFactorial(int&nbsp;k)</pre>
<div class="block">Returns <tt>log(k!)</tt>. Tries to avoid overflows. For <tt>k&lt;30</tt> simply looks up a table in O(1). For
<tt>k&gt;=30</tt> uses stirlings approximation.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>k</code> - must hold <tt>k &gt;= 0</tt>.</dd>
</dl>
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<h4>longFactorial</h4>
<pre>public static&nbsp;long&nbsp;longFactorial(int&nbsp;k)</pre>
<div class="block">Instantly returns the factorial <tt>k!</tt>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>k</code> - must hold <code>k &gt;= 0 &amp;&amp; k &lt; 21</code></dd>
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<h4>stirlingCorrection</h4>
<pre>public static&nbsp;double&nbsp;stirlingCorrection(int&nbsp;k)</pre>
<div class="block">Returns the StirlingCorrection. <p> Correction term of the Stirling approximation for <tt>log(k!)</tt> (series in
1/k, or table values for small k) with int parameter k. </p> <tt> log k! = (k + 1/2)log(k + 1) - (k + 1) +
(1/2)log(2Pi) + STIRLING_CORRECTION(k + 1) log k! = (k + 1/2)log(k) - k + (1/2)log(2Pi) +
STIRLING_CORRECTION(k) </tt></div>
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