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Top Forums Shell Programming and Scripting Problem using function in awk Post 302451075 by durden_tyler on Sunday 5th of September 2010 02:57:38 PM
Old 09-05-2010
Code:
$ 
$ awk '
function rgaussian1(r1, r2)
{      pi = 3.142
      v1 = sqrt( -2 * log(rand()) )
      v2 = 2 * pi * rand()
      r1 = a * sin(b)
      r2 = a * cos(b)
      print r1, r2
}
function rgaussian2(r1, r2)
{
      do {
          v1 = 2 * rand() - 1
          v2 = 2 * rand() - 1
          rsq = v1 * v1 + v2 * v2
      } while (rsq > 1)
      fac = sqrt(-2 * log(rsq) / rsq)
      r1 = v2 * fac
      r2 = v1 * fac
      print r1, r2
}
BEGIN {
  rgaussian1(0.556, 0.677);
  rgaussian2(0.799,0.808)
}'
0 0
-0.196896 0.195777
$ 
$

tyler_durden
 

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rand(3UCB)					     SunOS/BSD Compatibility Library Functions						rand(3UCB)

NAME
rand, srand - simple random number generator SYNOPSIS
/usr/ucb/cc [ flag ... ] file ... int rand(); int srand(seed) unsigned seed; DESCRIPTION
rand() uses a multiplicative congruential random number generator with period 2^32 to return successive pseudo-random numbers in the range from 0 to 2^31 -1. srand() 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. SEE ALSO
cc(1B), drand48(3C), rand(3C), random(3C) NOTES
Use of these interfaces should be restricted to only applications written on BSD platforms. Use of these interfaces with any of the system libraries or in multi-thread applications is unsupported. The spectral properties of rand() leave a great deal to be desired. drand48(3C) and random(3C) provide much better, though more elaborate, random-number generators. The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1. SunOS 5.11 30 Oct 2007 rand(3UCB)
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