# rgauss.f

          FUNCTION RGAUSS (XMEAN, SD)
    C***BEGIN PROLOGUE  RGAUSS
    C***PURPOSE  Generate a normally distributed (Gaussian) random number.
    C***LIBRARY   SLATEC (FNLIB)
    C***CATEGORY  L6A14
    C***TYPE      SINGLE PRECISION (RGAUSS-S)
    C***KEYWORDS  FNLIB, GAUSSIAN, NORMAL, RANDOM NUMBER, SPECIAL FUNCTIONS
    C***AUTHOR  Fullerton, W., (LANL)
    C***DESCRIPTION
    C
    C Generate a normally distributed random number, i.e., generate random
    C numbers with a Gaussian distribution.  These random numbers are not
    C exceptionally good -- especially in the tails of the distribution,
    C but this implementation is simple and suitable for most applications.
    C See R. W. Hamming, Numerical Methods for Scientists and Engineers,
    C McGraw-Hill, 1962, pages 34 and 389.
    C
    C             Input Arguments --
    C XMEAN  the mean of the Guassian distribution.
    C SD     the standard deviation of the Guassian function
    C          EXP (-1/2 * (X-XMEAN)**2 / SD**2)
    C
    C***REFERENCES  (NONE)
    C***ROUTINES CALLED  RAND
    C***REVISION HISTORY  (YYMMDD)
    C   770401  DATE WRITTEN
    C   861211  REVISION DATE from Version 3.2
    C   891214  Prologue converted to Version 4.0 format.  (BAB)
    C   910819  Added EXTERNAL statement for RAND due to problem on IBM
    C           RS 6000.  (WRB)
    C***END PROLOGUE  RGAUSS