Pseudo-random numbers/PCG32: Difference between revisions
Added Sidef
(→Python: As generator: Generates floats as well as ints.) |
(Added Sidef) |
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3215226955
{0=>20049, 1=>20022, 2=>20115, 3=>19809, 4=>20005}
</pre>
=={{header|Sidef}}==
{{trans|Perl}}
<lang ruby>class PCG32(seed, incr) {
has state
define (
mask32 = (2**32 - 1),
mask64 = (2**64 - 1),
N = 6364136223846793005,
)
method init {
seed := 1
incr := 2
incr = (((incr << 1) | 1) & mask64)
state = (((incr + seed)*N + incr) & mask64)
}
method next_int {
var shift = ((((state >> 18) ^ state) >> 27) & mask32)
var rotate = ((state >> 59) & mask32)
state = ((state*N + incr) & mask64)
((shift >> rotate) | (shift << (32-rotate))) & mask32
}
}
say "Seed: 42, Increment: 54, first 5 values:";
var rng = PCG32(seed: 42, incr: 54)
say 5.of { rng.next_int }
say "\nSeed: 987654321, Increment: 1, values histogram:";
var rng = PCG32(seed: 987654321, incr: 1)
var histogram = Bag(100_000.of { (5 * rng.next_int) >> 32 }...)
histogram.pairs.sort.each { .join(": ").say }</lang>
{{out}}
<pre>
Seed: 42, Increment: 54, first 5 values:
[2707161783, 2068313097, 3122475824, 2211639955, 3215226955]
Seed: 987654321, Increment: 1, values histogram:
0: 20049
1: 20022
2: 20115
3: 19809
4: 20005
</pre>
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