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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | //! \file ranlux.h
#ifndef __RANLUX_H__
#define __RANLUX_H__
/* This is a lagged fibonacci generator with skipping developed by Luescher.
The sequence is a series of 24-bit integers, x_n,
x_n = d_n + b_n
where d_n = x_{n-10} - x_{n-24} - c_{n-1}, b_n = 0 if d_n >= 0 and
b_n = 2^24 if d_n < 0, c_n = 0 if d_n >= 0 and c_n = 1 if d_n < 0,
where after 24 samples a group of p integers are "skipped", to
reduce correlations. By default p = 199, but can be increased to
365.
The period of the generator is around 10^171.
From: M. Luescher, "A portable high-quality random number generator
for lattice field theory calculations", Computer Physics
Communications, 79 (1994) 100-110.
Available on the net as hep-lat/9309020 at http://xxx.lanl.gov/
See also,
F. James, "RANLUX: A Fortran implementation of the high-quality
pseudo-random number generator of Luscher", Computer Physics
Communications, 79 (1994) 111-114
Kenneth G. Hamilton, F. James, "Acceleration of RANLUX", Computer
Physics Communications, 101 (1997) 241-248
Kenneth G. Hamilton, "Assembler RANLUX for PCs", Computer Physics
Communications, 101 (1997) 249-253 */
namespace siscone{
/// initialize 'ranlux' generator
void ranlux_init();
/// generate random value (24 bits)
unsigned long int ranlux_get();
/// save state of the generator
void ranlux_print_state();
}
#endif
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