<commit_before>/* 
   +----------------------------------------------------------------------+
   |                            HEP Random                                |
   |                      --- RandChiSquare ---                           |
   |                            Module File                               |
   +----------------------------------------------------------------------+
  
  

   +----------------------------------------------------------------------+
   | C++                                                                  |
   +----------------------------------------------------------------------+

  

   +----------------------------------------------------------------------+
   | JavaScript                                                           |
   +----------------------------------------------------------------------+

   <NAME> - Created 2015-10-30                  


*/

define( [], function(){
  "use strict";

  function RandChiSquare( ){

  } 





  RandChiSquare.prototype = {
    constructor: RandChiSquare,





  }

  return RandChiSquare;

});
<commit_msg>GenChiSquare, Shoot, ShootArray, Fire, FireArray added<commit_after>/* 
   +----------------------------------------------------------------------+
   |                            HEP Random                                |
   |                      --- RandChiSquare ---                           |
   |                            Module File                               |
   +----------------------------------------------------------------------+
   Module defining methods for shooting Chi^2 distributed random values,
   given a number of degrees of freedom a (default=1.0).

   Valid values of a satisfy a > 1. When invalid values are presented,
   the code silently returns -1.0.
   +----------------------------------------------------------------------+
   | JavaScript                                                           |
   +----------------------------------------------------------------------+
   <NAME> - Created 2015-10-30                  
   +----------------------------------------------------------------------+
   | C++                                                                  |
   +----------------------------------------------------------------------+
   <NAME> - Created: 12th May 1998
   <NAME>ler     - put and get to/from streams 12/10/04
   M Fischler	      - put/get to/from streams uses pairs of ulongs when
  			+ storing doubles avoid problems with precision 
  			4/14/05
*/

define( [ '../Random/JamesRandom' ], function( JamesRandom ){
  "use strict";

  function RandChiSquare( args ){
    this.a = args.a || 1.0;
    this.fengine = args.engine || Object.create( JamesRandom({}) );
  } 

  RandChiSquare.Shoot = function( args ){
    var sa = args.a || 1.0;
    var sengine = args.engine || Object.create( JamesRandom({}) );
  };

  RandChiSquare.ShootArray = function( args ){
    var ssize = args.size || 1;
    // var svect = args.vect;
    var sa = args.a || 1.0;
    var sengine = args.engine || Object.create( JamesRandom({}) );
    var argsShoot = { a: sa, engine: sengine };
    for( var i = 0; i < ssize; ++i ){
      args.vect.push( RandBinomial.Shoot( argsShoot ) );
    }
  };

  RandChiSquare.prototype = {
    constructor: RandChiSquare,

    Fire: function(){
      return GenChiSquare();
    },

    FireArray: function( /* size of vect */ size, /* Array */ vect ){
      for( var i = 0; i < size(); i++ ){
        vect.push( this.Fire() );  
      }
    },

    GenChiSquare: function(){
      /******************************************************************
       *                                                                *
       *        Chi Distribution - Ratio of Uniforms  with shift        *
       *                                                                *
       ******************************************************************
       *                                                                *
       * FUNCTION :   - chru samples a random number from the Chi       *
       *                distribution with parameter  a > 1.             *
       * REFERENCE :  - <NAME> (1987): An algorithm for           *
       *                generating chi random variables, ACM Trans.     *
       *                Math. Software 13, 168-172.                     *
       * SUBPROGRAM : - anEngine  ... pointer to a (0,1)-Uniform        *
       *                engine                                          *
       *                                                                *
       * Implemented by <NAME>, 1990                                 *
       ******************************************************************/
      var a_in = -1.0;
      var b,vm,vp,vd; // CLHEP_THREAD_LOCAL double's
      var u,v,z,zz,r; // double's

      // chech for invalid input value
      if( this.fa < 1 ) return -1;

      if( this.fa === 1 ){
        for(;;){
          u = this.fengine.Flat();
          v = this.fengine.Flat() * 0.857763884960707;
          z = v / u;
          if( z < 0 ) continue;
          zz = z * z;
          r = 2.5 - zz;
          if( z < 0.0 ) r += zz * z / ( 3.0 * z );
          if( u < r * 0.3894003915 ) return( z * z );
          if( zz > ( 1.036961043 / u + 1.4 ) ) continue;
          if( 2 * Math.log( u ) < ( - zz * 0.5 ) ) return( z * z );
        }
      } else {
        if( this.fa != a_in ){
          b = Math.sqrt( a - 1.0 );
          vm = - 0.6065306597 * ( 1.0 - 0.25 / ( b * b + 1.0 ) );
          vm = ( -b > vm )? -b: vm;
          vp = 0.6065306597 * (0.7071067812 + b) / (0.5 + b);
          vd = vp - vm;
          a_in = this.fa;
        }
        for(;;){
          u = this.fengine.Flat();
          v = this.fengine.Flat() * vd + vm;
          z = v / u;
          if( z < -b ) continue;
          zz = z * z;
          r = 2.5 - zz;
          if( z < 0.0 ) r += zz * z / ( 3.0 * ( z + b ) );
          if( u < r * 0.3894003915 ) return( ( z + b ) * ( z + b ) );
          if( zz > ( 1.036961043 / u + 1.4 ) ) continue;
          if( 2 * Math.log( u ) < ( Math.log( 1.0 + z / b ) * b * b - zz * 0.5 - z * b ) ) return ( ( z + b ) * ( z + b ) );
        }       
      }
    }
  }
  return RandChiSquare;
});

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