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<div class="subTitle">healpix.essentials</div>
<h2 title="Class HealpixUtils" class="title">Class HealpixUtils</h2>
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<pre>public class <span class="typeNameLabel">HealpixUtils</span>
extends <a href="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Collection of utility functions.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#HealpixUtils--">HealpixUtils</a></span>()</code> </td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#approx-double-double-double-">approx</a></span>(double a,
double b,
double epsilon)</code> </td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#approx-float-float-float-">approx</a></span>(float a,
float b,
float epsilon)</code> </td>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#check-boolean-java.lang.String-">check</a></span>(boolean cond,
<a href="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> errtxt)</code>
<div class="block">Evaluates cond; if it is false, throws an Exception containing errtxt.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#cosdist_zphi-double-double-double-double-">cosdist_zphi</a></span>(double z1,
double phi1,
double z2,
double phi2)</code>
<div class="block">Computes the cosine of the angular distance between two z, phi positions
on the unit sphere.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#cosdist_zphi-healpix.essentials.Zphi-healpix.essentials.Zphi-">cosdist_zphi</a></span>(<a href="../../healpix/essentials/Zphi.html" title="class in healpix.essentials">Zphi</a> zp1,
<a href="../../healpix/essentials/Zphi.html" title="class in healpix.essentials">Zphi</a> zp2)</code>
<div class="block">Computes the cosine of the angular distance between two z, phi positions
on the unit sphere.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#fmodulo-double-double-">fmodulo</a></span>(double v1,
double v2)</code>
<div class="block">Returns the remainder of the division <code>v1/v2</code>.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#ilog2-long-">ilog2</a></span>(long arg)</code>
<div class="block">Integer base 2 logarithm.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#isqrt-long-">isqrt</a></span>(long arg)</code>
<div class="block">Integer square root.</div>
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<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#nest2peano-long-int-">nest2peano</a></span>(long pix,
int order)</code> </td>
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<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#peano2nest-long-int-">peano2nest</a></span>(long pix,
int order)</code> </td>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../healpix/essentials/HealpixUtils.html#uniq2order-long-">uniq2order</a></span>(long uniq)</code> </td>
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<pre>public HealpixUtils()</pre>
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<pre>public static void check(boolean cond,
<a href="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> errtxt)
throws <a href="/usr/share/doc/default-jdk-doc/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block">Evaluates cond; if it is false, throws an Exception containing errtxt.</div>
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<pre>public static int ilog2(long arg)</pre>
<div class="block">Integer base 2 logarithm.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>arg</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the largest integer <code>n</code> that fulfills <code>2^n<=arg</code>.
For negative arguments and zero, 0 is returned.</dd>
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<pre>public static int isqrt(long arg)</pre>
<div class="block">Integer square root.</div>
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<dd><code>arg</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the integer <code>n</code> which fulfills <code>n^2<=arg<(n+1)^2</code></dd>
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<h4>cosdist_zphi</h4>
<pre>public static double cosdist_zphi(double z1,
double phi1,
double z2,
double phi2)</pre>
<div class="block">Computes the cosine of the angular distance between two z, phi positions
on the unit sphere.</div>
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<h4>cosdist_zphi</h4>
<pre>public static double cosdist_zphi(<a href="../../healpix/essentials/Zphi.html" title="class in healpix.essentials">Zphi</a> zp1,
<a href="../../healpix/essentials/Zphi.html" title="class in healpix.essentials">Zphi</a> zp2)</pre>
<div class="block">Computes the cosine of the angular distance between two z, phi positions
on the unit sphere.</div>
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<h4>fmodulo</h4>
<pre>public static double fmodulo(double v1,
double v2)</pre>
<div class="block">Returns the remainder of the division <code>v1/v2</code>.
The result is non-negative.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>v1</code> - dividend; can be positive or negative</dd>
<dd><code>v2</code> - divisor; must be positive</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>remainder of the division; positive and smaller than <code>v2</code></dd>
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<pre>public static boolean approx(float a,
float b,
float epsilon)</pre>
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<pre>public static boolean approx(double a,
double b,
double epsilon)</pre>
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<pre>public static int uniq2order(long uniq)</pre>
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<pre>public static long nest2peano(long pix,
int order)</pre>
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<pre>public static long peano2nest(long pix,
int order)</pre>
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