NAME

       gbrand - Sampling from random distributions

SYNOPSIS

       gbrand [options] NAME PARAMETERS...

DESCRIPTION

       Generates  a  grid of i.i.d. samples from a distribution. The name of the distribution and
       its parameters are specified on the command line.  the column index. Indeces start from 1.
       If  more  than one function are provided they are printed one after the other. The type of
       random number generator and the default seed can be set  with  the  environment  variables
       GSL_RNG_TYPE and GSL_RNG_SEED, respectively, as documented in GSL manual.

OPTIONS

       -r     specify number of rows (default 1)

       -c     specify number of columns (default 1)

       -R     set the seed (default 1)

       -v     verbose mode

       -h     this help

   List of valid distributions (with parameters):
       beta   a,b = shape parameters

       binomial
              p = probability, N = number of trials

       bivariate-gaussian
              sigmax = x std.dev., sigmay = y std.dev., rho = correlation

       cauchy a = scale parameter

       chisq  nu = degrees of freedom

       dir-2d none

       dir-3d none

       dir-nd n1 = number of dimensions of hypersphere

       erlang a = scale parameter, b = order

       exponential
              mu = mean value

       exppow a = scale parameter, b = power (1=exponential, 2=gaussian)

       aexppow
              m = mode, al = left scale, ar = right scale, bl = left shape, br = right shape

       fdist  nu1, nu2 = degrees of freedom parameters

       flat   a = lower limit, b = upper limit

       gamma  a = order, b = scale

       gaussian-tail
              a = lower limit, sigma = standard deviation

       gaussian
              sigma = standard deviation

       geometric
              p = bernoulli trial probability of success

       gumbel1
              a = order, b = scale parameter

       gumbel2
              a = order, b = scale parameter

       hypergeometric
              n1 = # tagged, n2 = # untagged, t = number of trials

       laplace
              a = scale parameter

       landau none

       levy   c = scale, a = power (1=cauchy, 2=gaussian)

       levy-skew
              c = scale, a = power (1=cauchy, 2=gaussian), b = skew

       logarithmic
              p = probability

       logistic
              a = scale parameter

       lognormal
              zeta = location parameter, sigma = scale parameter

       negative-binomial
              p = probability, a = order

       pareto a = power, b = scale parameter

       pascal p = probability, n = order (integer)

       poisson
              mu = scale parameter

       rayleigh-tail
              a = lower limit, sigma = scale parameter

       rayleigh
              sigma = scale parameter

       tdist  nu = degrees of freedom

       ugaussian-tail
              a = lower limit

       ugaussian
              none

       weibull
              a = scale parameter, b = exponent

       pareto3
              a = power, b = exponential parameter, s = scale parameter

EXAMPLES

       gbrand -c 2 -r 100 gaussian 2.5
              generate  two  columns  of 100 rows each sampling from a Gaussian distribution with
              mean 0 and standard deviation 2.5

       gbrand -R 145 -r 1000 exponential 1
              one hundredth exponantial variates with parameters 1, the the seed of  the  RNG  is
              set to 145

       gbrand -r 10 flat 3 4
              ten realizations of the r.v. uniformly distributed in [3,4]

AUTHOR

       Written by Giulio Bottazzi

REPORTING BUGS

       Report bugs to <gbutils@googlegroups.com>

       Package home page <http://cafim.sssup.it/~giulio/software/gbutils/index.html>

COPYRIGHT

       Copyright  © 2001-2018 Giulio Bottazzi This program is free software; you can redistribute
       it and/or modify it under the terms of the GNU  General  Public  License  (version  2)  as
       published by the Free Software Foundation;

       This  program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE.
       See the GNU General Public License for more details.