RAND(3F)RAND(3F)NAME
rand, drand, irand - return random values
SYNOPSIS
integer*4 function irand (iflag)
real*4 function rand (iflag)
real*8 function drand (iflag)
integer*4 iflag
DESCRIPTION
These functions use random(3) to generate sequences of random numbers.
If iflag is 0, the generator returns the next random number in the
sequence.
If iflag is 1, the generator is restarted and the first random value is
returned.
If iflag is otherwise nonzero, it is used as a new seed for the random
number generator, and the first new random value is returned. The
three functions share the same 256-byte state array.
irand returns positive integers in the range 0 through 2147483647.
rand and drand return values in the range 0.0 through 1.0.
The only advantage of these functions is that they are widely available
on UNIX systems. For better random number generators, see lcrans,
addrans, and shufrans in the Numerical Computation Guide.
FILES
libm.a
SEE ALSOrandom(3c)
2002/11/27 RAND(3F)