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annotate Doc/lib/libwhrandom.tex @ 5817:48b94de85bf3 legacy-trunk
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| author | Guido van Rossum <guido@python.org> |
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| date | Thu, 17 Jul 1997 16:29:42 +0000 |
| parents | 72986b716824 |
| children | 3468ea8645ca |
| rev | line source |
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1 \section{Standard Module \sectcode{whrandom}} |
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2 \stmodindex{whrandom} |
| 5261 | 3 |
| 4 This module implements a Wichmann-Hill pseudo-random number generator | |
| 5 class that is also named \code{whrandom}. Instances of the | |
| 6 \code{whrandom} class have the following methods: | |
| 7 \renewcommand{\indexsubitem}{(in module whrandom)} | |
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8 |
| 5261 | 9 \begin{funcdesc}{choice}{seq} |
| 10 Chooses a random element from the non-empty sequence \var{seq} and returns it. | |
| 11 \end{funcdesc} | |
| 12 | |
| 13 \begin{funcdesc}{randint}{a\, b} | |
| 14 Returns a random integer \var{N} such that \code{\var{a}<=\var{N}<=\var{b}}. | |
| 15 \end{funcdesc} | |
| 16 | |
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17 \begin{funcdesc}{random}{} |
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18 Returns the next random floating point number in the range [0.0 ... 1.0). |
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19 \end{funcdesc} |
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20 |
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21 \begin{funcdesc}{seed}{x\, y\, z} |
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22 Initializes the random number generator from the integers |
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23 \var{x}, |
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24 \var{y} |
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25 and |
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26 \var{z}. |
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27 When the module is first imported, the random number is initialized |
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28 using values derived from the current time. |
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29 \end{funcdesc} |
| 5261 | 30 |
| 31 \begin{funcdesc}{uniform}{a\, b} | |
| 32 Returns a random real number \var{N} such that \code{\var{a}<=\var{N}<\var{b}}. | |
| 33 \end{funcdesc} | |
| 34 | |
| 35 When imported, the \code{whrandom} module also creates an instance of | |
| 36 the \code{whrandom} class, and makes the methods of that instance | |
| 37 available at the module level. Therefore one can write either | |
| 38 \code{N = whrandom.random()} or: | |
| 39 \begin{verbatim} | |
| 40 generator = whrandom.whrandom() | |
| 41 N = generator.random() | |
| 42 \end{verbatim} |