.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.13.
.TH GBRAND "1" "June 2021" "gbrand 6.2" "User Commands"
.SH NAME
gbrand \- Sampling from random distributions
.SH SYNOPSIS
.B gbrand
[\fI\,options\/\fR] \fI\,NAME PARAMETERS\/\fR...
.SH 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.
.SH OPTIONS
.TP
\fB\-r\fR
specify number of rows (default 1)
.TP
\fB\-c\fR
specify number of columns (default 1)
.TP
\fB\-R\fR
set the seed (default 1)
.TP
\fB\-v\fR
verbose mode
.TP
\fB\-h\fR
this help
.SS "List of valid distributions (with parameters):"
.TP
beta
a,b = shape parameters
.TP
binomial
p = probability, N = number of trials
.TP
bivariate\-gaussian
sigmax = x std.dev., sigmay = y std.dev., rho = correlation
.TP
cauchy
a = scale parameter
.TP
chisq
nu = degrees of freedom
.TP
dir\-2d
none
.TP
dir\-3d
none
.TP
dir\-nd
n1 = number of dimensions of hypersphere
.TP
erlang
a = scale parameter, b = order
.TP
exponential
mu = mean value
.TP
exppow
a = scale parameter, b = power (1=exponential, 2=gaussian)
.TP
aexppow
m = mode, al = left scale, ar = right scale, bl = left shape, br = right shape
.TP
fdist
nu1, nu2 = degrees of freedom parameters
.TP
flat
a = lower limit, b = upper limit
.TP
gamma
a = order, b = scale
.TP
gaussian\-tail
a = lower limit, sigma = standard deviation
.TP
gaussian
sigma = standard deviation
.TP
geometric
p = bernoulli trial probability of success
.TP
gumbel1
a = order, b = scale parameter
.TP
gumbel2
a = order, b = scale parameter
.TP
hypergeometric
n1 = # tagged, n2 = # untagged, t = number of trials
.TP
laplace
a = scale parameter
.TP
landau
none
.TP
levy
c = scale, a = power (1=cauchy, 2=gaussian)
.TP
levy\-skew
c = scale, a = power (1=cauchy, 2=gaussian), b = skew
.TP
logarithmic
p = probability
.TP
logistic
a = scale parameter
.TP
lognormal
zeta = location parameter, sigma = scale parameter
.TP
negative\-binomial
p = probability, a = order
.TP
pareto
a = power, b = scale parameter
.TP
pascal
p = probability, n = order (integer)
.TP
poisson
mu = scale parameter
.TP
rayleigh\-tail
a = lower limit, sigma = scale parameter
.TP
rayleigh
sigma = scale parameter
.TP
tdist
nu = degrees of freedom
.TP
ugaussian\-tail
a = lower limit
.TP
ugaussian
none
.TP
weibull
a = scale parameter, b = exponent
.TP
pareto3
a = power, b = exponential parameter, s = scale parameter
.SH EXAMPLES
.TP
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
.TP
gbrand \-R 145 \-r 1000 exponential 1
one hundredth exponantial variates with parameters 1, the
the seed of the RNG is set to 145
.TP
gbrand \-r 10 flat 3 4
ten realizations of the r.v. uniformly distributed in [3,4]
.SH AUTHOR
Written by Giulio Bottazzi
.SH "REPORTING BUGS"
Report bugs to <gbutils@googlegroups.com>
.PP
.br
Package home page <http://cafim.sssup.it/~giulio/software/gbutils/index.html>
.SH COPYRIGHT
Copyright \(co 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;
.PP
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.