09-29-2004
Jim it has to run fast in ksh. I am developing a decimal arithemtic based multipy with carry. As far as I know, this is new ground. If I was coding in C, I would use the mersenne twister in a minute. I have toyed with trying to code it in ksh, but it's tough and I wouldn't trust my implementation until I understand how it works. Maybe next year. Meanwhile I want to get the MWC working. It is almost as fast as linear congruential generator. It really should be able to rid the world of lcg's. They persist only because they are fast and easily coded. Diehard is the first test that it hasn't passed. Diehard needs about 80,000,000 bits of random data for a single test run. This takes about 10 hours to generate, so progress is slow. I'm pretty sure the problem is arising when I convert the raw random number to an output modulus. But it will take a week or so to be sure.
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rand(3C) rand(3C)
NAME
rand(), rand_r(), srand() - simple random-number generator
SYNOPSIS
DESCRIPTION
uses a multiplicative, congruential, random-number generator with period 2^32 that returns successive pseudo-random numbers in the range
from 0 to 2^15-1.
can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a value
of 1.
returns a random number at the address pointed to by the randval parameter. The seed parameter can be set at any time to start the random-
number generator at an arbitrary point.
Note
The spectral properties of leave a great deal to be desired. provides a much better, though more elaborate, random-number generator (see
drand48(3C)).
RETURN VALUE
If seed or randval is NULL, returns 0. Otherwise, returns a psuedo-random integer.
EXAMPLES
The following:
int x, y;
srand(10);
x = rand();
y = rand();
would produce the same results as:
int x, y, s = 10;
x=rand_r(&s);
y=rand_r(&s);
WARNINGS
Users of should note that rand_r() now conforms with POSIX.1c. The old prototype of is supported for compatibility with existing DCE
applications only.
SEE ALSO
drand48(3C), random(3M), thread_safety(5), random(7).
STANDARDS CONFORMANCE
rand(3C)