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doc ///
Node
Key
setRandomSeed
(setRandomSeed, Sequence)
(setRandomSeed, String)
(setRandomSeed, ZZ)
Headline
set starting point for random number generator
Usage
setRandomSeed()
setRandomSeed(seed)
Consequences
Item
If {\tt seed} is {\tt ()}, initializes the random number generator to a fixed state,
identical to the initial state (upon program start) in version 1.2 and earlier of Macaulay2.
Otherwise sets {\tt randomSeed} to a value based on {\tt seed}.
Description
Text
Since version 1.2, when Macaulay2 starts the random number seed is initially set to
a number that depends on the current date, the time (in seconds), and the process id,
except for when running examples and tests in packages, where it is always initialized
to 0 by passing the command line option @TT "--no-randomize"@.
The sequence of future pseudo-random results is determined by the random number seed.
Example
setRandomSeed()
random 2^100
random 2^100
setRandomSeed()
random 2^100
random 2^100
Text
If an integer seed is given, the random number seed is set to the low-order 32 bits of the seed.
Example
setRandomSeed 123456
for i to 10 list random 100
setRandomSeed 123456
for i to 10 list random 100
Text
If a string seed is given, sets the random number seed to an integer computed from it.
Every character of the string contributes to the seed, but only 32 bits of data are used.
The sequence of future pseudo-random results is determined by the seed.
Example
setRandomSeed "thrkwjsxz"
for i to 10 list random 100
setRandomSeed "thrkwjsxz"
for i to 10 list random 100
SourceCode
(setRandomSeed, ZZ)
(setRandomSeed, String)
(setRandomSeed, Sequence)
///
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