C Library Functions - logran (3)

NAME

logran(3f) - [M_datapac:RANDOM] generate logistic random numbers

Synopsis
Description
Input Arguments
Output Arguments
Examples
Author
Maintainer
License
References

SYNOPSIS

SUBROUTINE LOGRAN(N,Iseed,X)

       INTEGER,intent(in)        :: N
       INTEGER,intent(inout)     :: Iseed
       REAL(kind=wp),intent(out) :: X(:)

DESCRIPTION

LOGRAN(3f) generates a random sample of size N from the logistic distribution with mean = 0 and standard deviation = pi/sqrt(3).
This distribution is defined for all X and has the probability density function
       f(X) = exp(X)/(1+exp(X))

INPUT ARGUMENTS

N The desired integer number of random numbers to be generated.

ISEED

An integer seed value. Should be set to a non-negative value to start a new sequence of values. Will be set to -1 on return to indicate the next call should continue the current random sequence walk.

OUTPUT ARGUMENTS

X A vector (of dimension at least N) into which the generated random sample of size N from the logistic distribution will be placed.

EXAMPLES

Sample program:

   program demo_logran
   use m_datapac, only : logran, plott, label, plotxt, sort
   implicit none
   integer,parameter :: n=4000
   integer           :: iseed
   real              :: x(n)
      call label(’logran’)
      iseed=12345
      call logran(N,Iseed,X)
      call plotxt(x,n)
      call sort(x,n,x) ! sort to show distribution
      call plotxt(x,n)
   end program demo_logran

Results:

THE FOLLOWING IS A PLOT OF X(I) (VERTICALLY) VERSUS I (HORIZONTALLY I-----------I-----------I-----------I-----------I 0.1011046E+02 - X 0.9310020E+01 I 0.8509579E+01 I X 0.7709137E+01 I X 0.6908696E+01 I X 0.6108254E+01 I X X X X X XXX 0.5307813E+01 - X X X X XX X X X X X X 0.4507371E+01 I X X X X XXX XXXX XXX X X X XX X X X 0.3706930E+01 I XXXXXXXXXXXXX XX XX XXX XXXXXXXXXXXXXXXXX X XXXXX 0.2906488E+01 I XXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXX 0.2106047E+01 I XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 0.1305605E+01 I XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 0.5051632E+00 - XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX -0.2952785E+00 I XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX -0.1095719E+01 I XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX -0.1896161E+01 I XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX -0.2696603E+01 I XXXXXXXXXXXXXXXXXXXXXXXXX XXXX XXXXXXXXXXXXXXXXXX -0.3497045E+01 I XX XXXX XXXXX XXXXXXXX XX XXXX XXXX XXXXXXXXXXXX -0.4297486E+01 - XXX XXXXXXX XX X XXX XXX XXXX XXXXX X X XXXX -0.5097927E+01 I XX X X X XXX XX X XXXX X XXX -0.5898369E+01 I X X X XX XXX X X -0.6698811E+01 I X -0.7499252E+01 I X -0.8299694E+01 I -0.9100137E+01 - X I-----------I-----------I-----------I-----------I 0.1000E+01 0.1001E+04 0.2000E+04 0.3000E+04 0.4000E+04

AUTHOR

The original DATAPAC library was written by James Filliben of the Statistical Engineering Division, National Institute of Standards and Technology.

MAINTAINER

John Urban, 2022.05.31

LICENSE

CC0-1.0

REFERENCES

o Tocher, The Art of Simulation, 1963, pages 14-15.

o Hammersley and Handscomb, Monte Carlo Methods, 1964, page 36.

o Filliben, Simple and Robust Linear Estimation of the Location Parameter of a Symmetric Distribution (Unpublished PH.D. Dissertation, Princeton University), 1969, page 230.

o Filliben, ’The Percent Point Function’, (Unpublished Manuscript), 1970, pages 28-31.

o Johnson and Kotz, Continuous Univariate Distributions--2, 1970, pages 1-21.

Nemo Release 3.1

logran (3)

February 23, 2025

Generated by manServer 1.08 from 5a170faa-8b12-4956-9d9b-eccfcfd5b80e using man macros.

o	Tocher, The Art of Simulation, 1963, pages 14-15.
o	Hammersley and Handscomb, Monte Carlo Methods, 1964, page 36.
o	Filliben, Simple and Robust Linear Estimation of the Location Parameter of a Symmetric Distribution (Unpublished PH.D. Dissertation, Princeton University), 1969, page 230.
o	Filliben, ’The Percent Point Function’, (Unpublished Manuscript), 1970, pages 28-31.
o	Johnson and Kotz, Continuous Univariate Distributions--2, 1970, pages 1-21.