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‚=5Dc @ su d Z d k Z e i d e ƒ d f d „ ƒ YZ e ƒ Z e i Z e i Z e i Z e i Z e i
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e i Z d S( s" Wichman-Hill random number generator.
Wichmann, B. A. & Hill, I. D. (1982)
Algorithm AS 183:
An efficient and portable pseudo-random number generator
Applied Statistics 31 (1982) 188-190
see also:
Correction to Algorithm AS 183
Applied Statistics 33 (1984) 123
McLeod, A. I. (1985)
A remark on Algorithm AS 183
Applied Statistics 34 (1985),198-200
USE:
whrandom.random() yields double precision random numbers
uniformly distributed between 0 and 1.
whrandom.seed(x, y, z) must be called before whrandom.random()
to seed the generator
There is also an interface to create multiple independent
random generators, and to choose from other ranges.
Multi-threading note: the random number generator used here is not
thread-safe; it is possible that nearly simultaneous calls in
different theads return the same random value. To avoid this, you
have to use a lock around all calls. (I didn't want to slow this
down in the serial case by using a lock here.)
Ns? the whrandom module is deprecated; please use the random modulet whrandomc B se t Z d d d d „ Z d d d d „ Z d „ Z d „ Z d „ Z d „ Z d d e d d „ Z
RS(
Ni c C s | i | | | ƒ d S( sˆ Initialize an instance.
Without arguments, initialize from current time.
With arguments (x, y, z), initialize from them.N( t selft seedt xt yt z( R R R R ( ( t /usr/lib64/python2.4/whrandom.pyt __init__- s c C s… t | ƒ t | ƒ j o" t | ƒ j o t d ƒ j n p
t d ‚ n d | j o
d j n o9 d | j o
d j n o d | j o
d j n p
t d ‚ n d | j o | j o
| j n oz d k } t | i ƒ d ƒ } t | d @| d ?Aƒ } t
| d ƒ \ } } t
| d ƒ \ } } t
| d ƒ \ } } n | p d | p d | p d f | _ d S( sR Set the seed from (x, y, z).
These must be integers in the range [0, 256).i s seeds must be integersi s seeds must be in range(0, 256)Niÿÿÿ i i (
t typeR R R t TypeErrort
ValueErrort timet longt tt intt divmodR t _seed( R R R R R
R ( ( R R 3 s B
Z
* c C sj | i \ } } } d | d } d | d } d | d } | | | f | _ | d | d | d d
S( s3 Get the next random number in the range [0.0, 1.0).i« i=v i¬ icv iª isv f30269.0f30307.0f30323.0f1.0N( R R R R R ( R R R R ( ( R t randomE s c C s | | | | i ƒ S( s( Get a random number in the range [a, b).N( t at bR R ( R R R ( ( R t uniformT s c C s | i | | d ƒ S( sw Get a random integer in the range [a, b] including
both end points.
(Deprecated; use randrange below.)i N( R t randrangeR R ( R R R ( ( R t randintX s c C s | t | i ƒ t | ƒ ƒ S( s2 Choose a random element from a non-empty sequence.N( t seqR R R t len( R R ( ( R t choice_ s i c
C s… | | ƒ } | | j o
t d ‚ n | | j o2 | d j o | | i ƒ | ƒ Sn t d ‚ n | | ƒ } | | j o
t d ‚ n | d j o: | | j o | | | i ƒ | | ƒ Sn t d ‚ n | | ƒ } | | j o
t d ‚ n | d j o | | | d | } n1 | d j o | | | d | } n
t d ‚ | d j o
t d ‚ n | | | | i ƒ | ƒ S( sï Choose a random item from range(start, stop[, step]).
This fixes the problem with randint() which includes the
endpoint; in Python this is usually not what you want.
Do not supply the 'int' and 'default' arguments.s! non-integer arg 1 for randrange()i s empty range for randrange()s non-integer stop for randrange()i s non-integer step for randrange()s zero step for randrange()N( R t startt istartR
t stopt defaultR R t istopt stept istept n(
R R R R R R R R! R R ( ( R R c s4
( t __name__t
__module__R R R R R R t NoneR R ( ( ( R R , s ( t __doc__t warningst warnt DeprecationWarningR t _instR R R R R R ( R R& R R R R R R R) ( ( R t ?" s ^