| Line 37... |
Line 37... |
| 37 |
return to the \R default. See \sQuote{Details} for the
|
37 |
return to the \R default. See \sQuote{Details} for the
|
| 38 |
interpretation of \code{NULL}.}
|
38 |
interpretation of \code{NULL}.}
|
| 39 |
\item{normal.kind}{character string or \code{NULL}. If it is a character
|
39 |
\item{normal.kind}{character string or \code{NULL}. If it is a character
|
| 40 |
string, set the method of Normal generation. Use \code{"default"}
|
40 |
string, set the method of Normal generation. Use \code{"default"}
|
| 41 |
to return to the \R default. \code{NULL} makes no change.}
|
41 |
to return to the \R default. \code{NULL} makes no change.}
|
| 42 |
\item{seed}{a single value, interpreted as an integer.}
|
42 |
\item{seed}{a single value, interpreted as an integer, or \code{NULL}
|
| - |
|
43 |
(see \sQuote{Details}).}
|
| 43 |
\item{vstr}{a character string containing a version number,
|
44 |
\item{vstr}{a character string containing a version number,
|
| 44 |
e.g., \code{"1.6.2"}}
|
45 |
e.g., \code{"1.6.2"}}
|
| 45 |
\item{rng.kind}{integer code in \code{0:k} for the above \code{kind}.}
|
46 |
\item{rng.kind}{integer code in \code{0:k} for the above \code{kind}.}
|
| 46 |
\item{n1, n2, \dots}{integers. See the details for how many are required
|
47 |
\item{n1, n2, \dots}{integers. See the details for how many are required
|
| 47 |
(which depends on \code{rng.kind}).}
|
48 |
(which depends on \code{rng.kind}).}
|
| Line 145... |
Line 146... |
| 145 |
results. The \code{"Box-Muller"} generator is stateful as pairs of
|
146 |
results. The \code{"Box-Muller"} generator is stateful as pairs of
|
| 146 |
normals are generated and returned sequentially. The state is reset
|
147 |
normals are generated and returned sequentially. The state is reset
|
| 147 |
whenever it is selected (even if it is the current normal generator)
|
148 |
whenever it is selected (even if it is the current normal generator)
|
| 148 |
and when \code{kind} is changed.
|
149 |
and when \code{kind} is changed.
|
| 149 |
|
150 |
|
| 150 |
\code{set.seed} uses its single integer argument to set as many seeds
|
151 |
\code{set.seed} uses a single integer argument to set as many seeds
|
| 151 |
as are required. It is intended as a simple way to get quite different
|
152 |
as are required. It is intended as a simple way to get quite different
|
| 152 |
seeds by specifying small integer arguments, and also as a way to get
|
153 |
seeds by specifying small integer arguments, and also as a way to get
|
| 153 |
valid seed sets for the more complicated methods (especially
|
154 |
valid seed sets for the more complicated methods (especially
|
| 154 |
\code{"Mersenne-Twister"} and \code{"Knuth-TAOCP"}). There is no
|
155 |
\code{"Mersenne-Twister"} and \code{"Knuth-TAOCP"}). There is no
|
| 155 |
guarantee that different values of \code{seed} will seed the RNG
|
156 |
guarantee that different values of \code{seed} will seed the RNG
|
| 156 |
differently, although any exceptions would be extremely rare.
|
157 |
differently, although any exceptions would be extremely rare. If
|
| - |
|
158 |
called with \code{seed = NULL} it re-initializes (see \sQuote{Note})
|
| - |
|
159 |
as if no seed had yet been set.
|
| 157 |
|
160 |
|
| 158 |
The use of \code{kind = NULL} or \code{normal.kind = NULL} in
|
161 |
The use of \code{kind = NULL} or \code{normal.kind = NULL} in
|
| 159 |
\code{RNGkind} or \code{set.seed} selects the currently-used
|
162 |
\code{RNGkind} or \code{set.seed} selects the currently-used
|
| 160 |
generator (including that used in the previous session if the
|
163 |
generator (including that used in the previous session if the
|
| 161 |
workspace has been restored): if no generator has been used it selects
|
164 |
workspace has been restored): if no generator has been used it selects
|
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