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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified Sat Jul 24 19:46:03 1993 by Rik Faith (faith@cs.unc.edu)
.\"
.\" Japanese Version Copyright (c) 1997 YOSHINO Takashi
.\"       all rights reserved.
.\" Translated Mon Jan 20 20:04:05 JST 1997
.\"       by YOSHINO Takashi <yoshino@civil.jcn.nihon-u.ac.jp>
.\"
.\" WORD: internal buffer  ÆâÉô¥Ð¥Ã¥Õ¥¡
.\"
.TH DRAND48 3  2007-07-26 "" "Linux Programmer's Manual"
.SH ̾Á°
drand48, erand48, lrand48, nrand48, mrand48, jrand48, srand48, seed48,
lcong48 \- °ìÍÍʬÉÛ¤¹¤ëµ¿»÷Íð¿ô¤òÀ¸À®¤¹¤ë´Ø¿ô
.SH ½ñ¼°
.nf
.B #include <stdlib.h>
.sp
.B double drand48(void);
.sp
.BI "double erand48(unsigned short " xsubi [3]);
.sp
.B long int lrand48(void);
.sp
.BI "long int nrand48(unsigned short " xsubi [3]);
.sp
.B long int mrand48(void);
.sp
.BI "long int jrand48(unsigned short " xsubi [3]);
.sp
.BI "void srand48(long int " seedval );
.sp
.BI "unsigned short *seed48(unsigned short " seed16v [3]);
.sp
.BI "void lcong48(unsigned short " param [7]);
.fi
.sp
.in -4n
glibc ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
.RB ( feature_test_macros (7)
»²¾È):
.in
.sp
.ad l
¾åµ­¤ÎÁ´¤Æ¤Î´Ø¿ô:
.\" .BR drand48 (),
.\" .BR erand48 (),
.\" .BR lrand48 (),
.\" .BR nrand48 (),
.\" .BR mrand48 (),
.\" .BR jrand48 (),
.\" .BR srand48 (),
.\" .BR seed48 (),
.\" .BR lcong48 ():
_SVID_SOURCE || _XOPEN_SOURCE
.ad b
.SH ÀâÌÀ
¤³¤ì¤é¤Î´Ø¿ô¤ÏÀþ·Á¹çƱ¥¢¥ë¥´¥ê¥º¥à¤È 48¥Ó¥Ã¥ÈÀ°¿ô±é»»¤òÍѤ¤¤Æ
µ¿»÷Íð¿ô¤òÀ¸À®¤¹¤ë¡£
.PP
´Ø¿ô
.BR drand48 ()
¤È
.BR erand48 ()
¤Ï¡¢¶è´Ö [0.0, 1.0) ¤Ç
°ìÍÍʬÉÛ¤¹¤ëÈóÉé¤ÎÇÜÀºÅÙÉâÆ°¾®¿ôÅÀ¼Â¿ôÃͤòÊÖ¤¹¡£
.PP
´Ø¿ô
.BR lrand48 ()
¤È
.BR nrand48 ()
¤Ï 0 ¤È 2^31 ¤Î´Ö¤Ç°ìÍÍʬÉÛ¤¹¤ë
ÈóÉé¤Î¥í¥ó¥°À°¿ô¤òÊÖ¤¹¡£
.PP
´Ø¿ô
.BR mrand48 ()
¤È
.BR jrand48 ()
¤Ï
\-2^31 ¤È 2^31 ¤Î´Ö¤Ç°ìÍÍʬÉÛ¤¹¤ëÉä¹æÉÕ¤­¥í¥ó¥°À°¿ô¤òÊÖ¤¹¡£
.PP
´Ø¿ô
.BR srand48 (),
.BR seed48 (),
.BR lcong48 ()
¤Ï½é´ü²½´Ø¿ô
¤Ç¤¢¤ë¡£
´Ø¿ô
.BR drand48 (),
.BR lrand48 (),
.BR mrand48 ()
¤ò
»ÈÍѤ¹¤ëÁ°¤Ë¡¢¤³¤ì¤é¤Î½é´ü²½´Ø¿ô¤Î¤¤¤º¤ì¤«¤ò¸Æ¤Ö¤Ù¤­¤Ç¤¢¤ë¡£
´Ø¿ô
.BR erand48 (),
.BR nrand48 (),
.BR jrand48 ()
¤Ï½é¤á¤Ë
½é´ü²½´Ø¿ô¤ò¸Æ¤Ö¤³¤È¤òɬÍפȤ·¤Ê¤¤¡£
.PP
¤³¤³¤ÇÀâÌÀ¤·¤Æ¤¤¤ë¤¹¤Ù¤Æ¤Î´Ø¿ô¤Ï 48¥Ó¥Ã¥È¤ÎÀ°¿ô¤Î
¥·¡¼¥±¥ó¥¹ (\fIXi\fP) ¤òÀ¸À®¤¹¤ë¤³¤È¤Ç
µ¡Ç½¤·¤Æ¤¤¤ë¡£À¸À®ÊýË¡¤Ï°Ê²¼¤ÎÀþ·Á¹çƱ¤Î¼°¤Ë¤è¤ë¡£
.sp
.nf
.RS
.B Xn+1 = (aXn + c) mod m,
.RE
.fi
.sp
¤³¤³¤Ç n >= 0 ¤Ç¤¢¤ë¡£
¥Ñ¥é¥á¡¼¥¿¤¬ \fIm\fP = 2^48 ¤Ç¤¢¤ë¤¿¤á¡¢48¥Ó¥Ã¥ÈÀ°¿ô±é»»¤¬¹Ô¤ï¤ì¤Æ¤¤¤ë¡£
.BR lcong48 ()
¤¬¸Æ¤Ð¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç¡¢\fIa\fP ¤È \fIc\fP ¤Ï°Ê²¼¤Î¼°¤ÇÍ¿¤¨¤é¤ì¤ë¡£
.sp
.nf
.RS
.B a = 0x5DEECE66D
.B c = 0xB
.RE
.fi
.sp
´Ø¿ô
.BR drand48 (),
.BR erand48 (),
.BR lrand48 (),
.BR nrand48 (),
.BR mrand48 (),
.BR jrand48 ()
¤ÇÊÖ¤µ¤ì¤ëÃͤϼ¡¤Î¤è¤¦¤Ë¤·¤Æ·×»»¤µ¤ì¤ë¡£
¤Ï¤¸¤á¤Ë¡¢¼¡¤Î48¥Ó¥Ã¥È¤Î \fIXi\fP ¤¬·×»»¤µ¤ì¤ë¡£
¤½¤·¤Æ¡¢ÊÖ¤¹¤Ù¤­¥Ç¡¼¥¿¤Î·¿¤Ë°Í¸¤·¤¿Å¬ÀÚ¤Ê
¥Ó¥Ã¥È¿ô¤¬ \fIXi\fP ¤Î¾å°Ì¥Ó¥Ã¥È¤«¤é¥³¥Ô¡¼¤µ¤ì¤ë¡£
ºÇ¸å¤Ë¡¢¤³¤ÎÃͤòÊÖ¤êÃͤËÊÑ´¹¤¹¤ë¡£
.PP
´Ø¿ô
.BR drand48 (),
.BR lrand48 (),
.BR mrand48 ()
¤Ï
ºÇ¸å¤ËÀ¸À®¤µ¤ì¤¿48¥Ó¥Ã¥È¤Î \fIXi\fP ¤òÆâÉô¥Ð¥Ã¥Õ¥¡¤Ë³ÊǼ¤¹¤ë¡£
ÇÛÎó¤Î·Á¤Î°ú¿ô \fIxsubi\fP ¤Ë¸Ä¡¹¤Î \fIXi\fP ¤ÎÃͤò
³ÊǼ¤Ç¤­¤ë¤è¤¦¤ÊÎΰè¤ò³ÎÊݤ¹¤ë¤³¤È¤ò¡¢
´Ø¿ô
.BR erand48 (),
.BR nrand48 (),
.BR jrand48 ()
¤Ï¡¢
¸Æ¤Ó½Ð¤·Â¦¤Î¥×¥í¥°¥é¥à¤ËÍ׵᤹¤ë¡£
¤³¤ì¤é¤Î´Ø¿ô¤Ï¡¢¤Ï¤¸¤á¤Æ¤½¤ì¤é¤Î´Ø¿ô¤ò¸Æ¤ÖÁ°¤Ë \fIXi\fP ¤Î½é´üÃͤòÇÛÎó¤Ë
ÂåÆþ¤¹¤ë¤³¤È¤Ç½é´ü²½¤µ¤ì¤ë¡£
.PP
½é´ü²½´Ø¿ô
.BR srand48 ()
¤Ï¡¢\fIXi\fP ¤Î
¾å°Ì32¥Ó¥Ã¥È¤ò°ú¿ô \fIseedval\fP ¤ËÀßÄꤹ¤ë¡£
²¼°Ì¤Î16¥Ó¥Ã¥È¤Ï¡¢Å¬Åö¤Ë·è¤á¤é¤ì¤¿ÃͤǤ¢¤ë0x330E¤ËÀßÄꤵ¤ì¤ë¡£
.PP
½é´ü²½´Ø¿ô
.BR seed48 ()
¤Ï¡¢\fIXi\fP ¤ÎÃͤò¡¢
ÇÛÎó¤Î·Á¤ò¤·¤¿°ú¿ô¤Ç¤¢¤ë \fIseed16v\fP ¤ÎÃæ¤Ç»ØÄꤵ¤ì¤¿ 48¥Ó¥Ã¥È¤ÎÃͤËÀßÄꤹ¤ë¡£
\fIXi\fP ¤ÎÁ°¤ÎÃͤÏÆâÉô¥Ð¥Ã¥Õ¥¡¤Ë¥³¥Ô¡¼¤µ¤ì¡¢¤³¤Î¥Ð¥Ã¥Õ¥¡¤Ø¤Î¥Ý¥¤¥ó¥¿¤¬
.BR seed48 ()
¤Ë¤è¤Ã¤ÆÊÖ¤µ¤ì¤ë¡£
.PP
½é´ü²½´Ø¿ô
.BR lcong48 ()
¤Ï»ÈÍѼԤ¬ \fIXi\fP, \fIa\fP, \fIc\fP ¤Î
½é´üÃͤò»ØÄꤹ¤ë¤¿¤á¤Î´Ø¿ô¤Ç¤¢¤ë¡£
ÇÛÎó¤Î·Á¤ò¤·¤¿°ú¿ô¤ÎÍ×ÁǤϤ½¤ì¤¾¤ì¡¢\fIparam[0-2]\fP ¤Ï \fIXi\fP ¤ò¡¢
\fIparam[3-5]\fP ¤Ï \fIa\fP ¤ò¡¢\fIparam[6]\fP ¤Ï \fIc\fP ¤ò»ØÄꤹ¤ë¤â¤Î
¤Ç¤¢¤ë¡£
.BR lcong48 ()
¤¬¸Æ¤Ð¤ì¤¿¸å¤Ç¡¢
.BR srand48 ()
¤«
.BR seed48 ()
¤ò¸Æ¤Ö¤È¡¢Á°½Ò¤Î \fIa\fP ¤È \fIc\fP ¤Î
ɸ½àÃͤ¬ºÆ¤ÓÀßÄꤵ¤ì¤ë¡£
.SH ½àµò
SVr4, POSIX.1-2001.
.SH Ãí°Õ
SVID 3 ¤Ç¤Ï¤³¤ì¤é¤Î´Ø¿ô¤Ï»þÂåÃÙ¤ì¤ÈÀë¸À¤µ¤ì¤Æ¤¤¤ë¡£
SVID 3 ¤Ç¤Ï
.BR rand (3)
¤¬Âå¤ï¤ê¤Ë»ÈÍѤµ¤ì¤ë¤Ù¤­¤À¤Èµ­½Ò¤µ¤ì¤Æ¤¤¤ë¡£
.SH ´ØÏ¢¹àÌÜ
.BR rand (3),
.BR random (3)