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Recommend calling srand() or srandom() with seed()

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Landon Curt Noll
2021-12-09 01:34:58 -08:00
parent c0be37d4e3
commit 0d31eb6828
2 changed files with 12 additions and 2 deletions
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7
help/srand
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@@ -12,6 +12,11 @@ TYPES
DESCRIPTION DESCRIPTION
Seed the pseudo-random number using an subtractive 100 shuffle generator. Seed the pseudo-random number using an subtractive 100 shuffle generator.
It you want a quick and effective way to seed the generator,
we recommended that you call srand() with the seed() value:
srand(seed())
For integer seed != 0: For integer seed != 0:
Any buffered rand generator bits are flushed. The subtractive table Any buffered rand generator bits are flushed. The subtractive table
@@ -150,7 +155,7 @@ LINK LIBRARY
SEE ALSO SEE ALSO
seed, srandom, randbit, isrand, random, srandom, israndom seed, srandom, randbit, isrand, random, srandom, israndom
## Copyright (C) 1999 Landon Curt Noll ## Copyright (C) 1999,2021 Landon Curt Noll
## ##
## Calc is open software; you can redistribute it and/or modify it under ## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License ## the terms of the version 2.1 of the GNU Lesser General Public License

7
help/srandom
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@@ -20,6 +20,11 @@ TYPES
DESCRIPTION DESCRIPTION
Seed the pseudo-random number using the Blum-Blum-Shub generator. Seed the pseudo-random number using the Blum-Blum-Shub generator.
It you want a quick and effective way to seed the generator,
we recommended that you call srandom() with the seed() value:
srandom(seed())
There are two primary values contained inside generator state: There are two primary values contained inside generator state:
Blum modulus: Blum modulus:
@@ -58,7 +63,7 @@ DESCRIPTION
call of srandom(0) will restore the generator to the state call of srandom(0) will restore the generator to the state
found when calc starts. found when calc starts.
1 arg (seed >= 2^32): srandom(21609139158123209^9+17) 1 arg (seed >= 2^32): srandom(seed())
The seed value is used to compute the new quadratic residue. The seed value is used to compute the new quadratic residue.
The seed passed will be successively squared mod the Blum The seed passed will be successively squared mod the Blum