com.opengamma.strata.math.impl.cern.Constants Maven / Gradle / Ivy

/*
 * Copyright (C) 2009 - present by OpenGamma Inc. and the OpenGamma group of companies
 *
 * Please see distribution for license.
 */
/*
 * This code is copied from the original library from the `cern.jet.math` package.
 * Changes:
 * - package name
 * - missing Javadoc param tags
 * - reformat
 * - make package scoped
 */
/*
Copyright � 1999 CERN - European Organization for Nuclear Research.
Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose
is hereby granted without fee, provided that the above copyright notice appear in all copies and
that both that copyright notice and this permission notice appear in supporting documentation.
CERN makes no representations about the suitability of this software for any purpose.
It is provided "as is" without expressed or implied warranty.
*/
package com.opengamma.strata.math.impl.cern;

//CSOFF: ALL
/**
 * Defines some useful constants.
 */
class Constants {
  /*
   * machine constants
   */
  protected static final double MACHEP = 1.11022302462515654042E-16;
  protected static final double MAXLOG = 7.09782712893383996732E2;
  protected static final double MINLOG = -7.451332191019412076235E2;
  protected static final double MAXGAM = 171.624376956302725;
  protected static final double SQTPI = 2.50662827463100050242E0;
  protected static final double SQRTH = 7.07106781186547524401E-1;
  protected static final double LOGPI = 1.14472988584940017414;

  protected static final double big = 4.503599627370496e15;
  protected static final double biginv = 2.22044604925031308085e-16;

  /*
  * MACHEP =  1.38777878078144567553E-17       2**-56
  * MAXLOG =  8.8029691931113054295988E1       log(2**127)
  * MINLOG = -8.872283911167299960540E1        log(2**-128)
  * MAXNUM =  1.701411834604692317316873e38    2**127
  *
  * For IEEE arithmetic (IBMPC):
  * MACHEP =  1.11022302462515654042E-16       2**-53
  * MAXLOG =  7.09782712893383996843E2         log(2**1024)
  * MINLOG = -7.08396418532264106224E2         log(2**-1022)
  * MAXNUM =  1.7976931348623158E308           2**1024
  *
  * The global symbols for mathematical constants are
  * PI     =  3.14159265358979323846           pi
  * PIO2   =  1.57079632679489661923           pi/2
  * PIO4   =  7.85398163397448309616E-1        pi/4
  * SQRT2  =  1.41421356237309504880           sqrt(2)
  * SQRTH  =  7.07106781186547524401E-1        sqrt(2)/2
  * LOG2E  =  1.4426950408889634073599         1/log(2)
  * SQ2OPI =  7.9788456080286535587989E-1      sqrt( 2/pi )
  * LOGE2  =  6.93147180559945309417E-1        log(2)
  * LOGSQ2 =  3.46573590279972654709E-1        log(2)/2
  * THPIO4 =  2.35619449019234492885           3*pi/4
  * TWOOPI =  6.36619772367581343075535E-1     2/pi
  */

  /**
   * Makes this class non instantiable, but still let's others inherit from it.
   */
  protected Constants() {
  }
}