[u/mrichter/AliRoot.git] / TEvtGen / Photos / PhotosRandom.h

#ifndef _PhotosRandom_included_
#define _PhotosRandom_included_

/**
 * @class PhotosRandom
 *
 * @brief Photos random number generator rewritten from PHOTOS FORTRAN
 *
 * Generates uniformly distributed random numbers between 0 and 1.
 * Must be initialized by call to PhotosRandom::initialize().
 * Original authors: B. van Eijk, F. James, G. Marsaglia and A. Zaman
 *
 * @author Tomasz Przedzinski
 * @date 18th October 2010
 */

namespace Photospp
{

class PhotosRandom
{
public:
	/* Change the seed. Default is s1=1802 and s2=9373
	   These values must be in range [0,31327] and [0,30080] respectively */
	static void setSeed(int s1,int s2);

	/* Initialization routine. Must be called at least once before
	   the generator can be used. */
	static void initialize();

	/* Uniform distribution between 0 and 1 */
	static double randomReal();

protected:
	static bool init;
	static int iseed[2];
	static int i97;
	static int j97;
	static double uran[97];
	static double cran;
	static const double cdran;
	static const double cmran;
};

} // namespace Photospp
#endif
Commit	Line	Data
0ca57c2f	1	#ifndef _PhotosRandom_included_
	2	#define _PhotosRandom_included_
	3
	4	/**
	5	* @class PhotosRandom
	6	*
	7	* @brief Photos random number generator rewritten from PHOTOS FORTRAN
	8	*
	9	* Generates uniformly distributed random numbers between 0 and 1.
	10	* Must be initialized by call to PhotosRandom::initialize().
	11	* Original authors: B. van Eijk, F. James, G. Marsaglia and A. Zaman
	12	*
	13	* @author Tomasz Przedzinski
	14	* @date 18th October 2010
	15	*/
	16
	17	namespace Photospp
	18	{
	19
	20	class PhotosRandom
	21	{
	22	public:
	23	/* Change the seed. Default is s1=1802 and s2=9373
	24	These values must be in range [0,31327] and [0,30080] respectively */
	25	static void setSeed(int s1,int s2);
	26
	27	/* Initialization routine. Must be called at least once before
	28	the generator can be used. */
	29	static void initialize();
	30
	31	/* Uniform distribution between 0 and 1 */
	32	static double randomReal();
	33
	34	protected:
	35	static bool init;
	36	static int iseed[2];
	37	static int i97;
	38	static int j97;
	39	static double uran[97];
	40	static double cran;
	41	static const double cdran;
	42	static const double cmran;
	43	};
	44
	45	} // namespace Photospp
	46	#endif