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# dSFMT Documentation

### 1.3

This is double precision SIMD oriented Fast Mersenne Twister pseudorandom number generator (dSFMT). This program is based on the IEEE Standard for Binary Floating-Point Arithmetic (ANSI/IEEE Std 754-1985) format.

This version uses structure of C language. Don't use different DSFMT_MEXP for compiling dSFMT.c and your program.

This Project provides pseudorandom number generators of various Mersenne Prime Period: from 2607-1 to 2216091-1.

To get dSFMT which has the period of 2607-1, you have to specify -DMEXP=607 as a compile option. For example,

     gcc -DDSFMT_MEXP=607 -msse2 -DHAVE_SSE2 -c dSFMT.c

will make dSFMT which has the period of 2607-1 and is optimized for SSE2.

See How to compile to compile your program with SFMT optimized for SIMD.

- void dsfmt_init_gen_rand() initializes the generator with a 32-bit integer seed.
- void dsfmt_init_by_array() initializes the generator with an array of 32-bit integers as the seeds.
- const char * dsfmt_get_idstring() returns the IDSTRING which identify the generator.
- int dsfmt_get_min_array_size() returns the minimum size of array used for fill_array functions.
- inline double dsfmt_genrand_close1_open2() generates and returns a double precision pseudorandom number which distributes uniformly in the range [1, 2). This is the primitive and faster than generating numbers in other ranges.
- inline double dsfmt_genrand_close_open() generates and returns a double precision pseudorandom number which distributes uniformly in the range [0, 1).
- inline double dsfmt_genrand_open_close() generates and returns a double precision pseudorandom number which distributes uniformly in the range (0, 1].
- inline double dsfmt_genrand_open_open() generates and returns a double precision pseudorandom number which distributes uniformly in the range (0, 1).
- void dsfmt_fill_array_close1_open2() fills the user-specified array with double precision pseudorandom numbers which distribute uniformly in the range [1, 2).
- void dsfmt_fill_array_close_open() fills the user-specified array with double precision pseudorandom numbers which distribute uniformly in the range [0, 1).
- void dsfmt_fill_array_open_close() fills the user-specified array with double precision pseudorandom numbers which distribute uniformly in the range (0, 1].
- void dsfmt_fill_array_open_open() fills the user-specified array with double precision pseudorandom numbers which distribute uniformly in the range (0, 1).

Old names init_gen_rand, init_by_array, etc. are also defined unless you define DSFMT_DO_NOT_USE_OLD_NAMES.

Author:
  Mutsuo Saito (saito@our-domain) Hiroshima University

  Makoto Matsumoto (m-mat@our-domain) Hiroshima University

Please change our-domain to math.sci.hiroshima-u.ac.jp

Date:
  2008-02-28

Copyright (C) 2007, 2008 Mutsuo Saito, Makoto Matsumoto and Hiroshima University. All rights reserved.

The new BSD License is applied to this software.

    Copyright (c) 2007, 2008 Mutsuo Saito, Makoto Matsumoto and Hiroshima
    University.  All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
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        * Redistributions of source code must retain the above copyright
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        * Redistributions in binary form must reproduce the above
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        * Neither the name of the Hiroshima University nor the names of
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