# binreg package for R (http://www.R-project.org)
# Copyright (C) 2013 Bernardo dos Santos, Adriano Polpo,
# Carlos A. de B. Pereira.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Weibull density function
dweib <- function(x, gamma = 1) {
if(length(gamma) != 1)
stop("gamma = ", deparse(substitute(gamma)), " should have exactly one element.")
x <- pmax(x, 0)
return(gamma*x^(gamma - 1)*exp(-x^gamma))
}
# Weibull distribution function
pweib <- function(q, gamma = 1) {
if(length(gamma) != 1)
stop("gamma = ", deparse(substitute(gamma)), " should have exactly one element.")
q <- pmax(q, 0)
return(1 - exp(-(q^gamma)))
}
# Weibull quantile function
qweib <- function(p, gamma = 1) {
if(length(gamma) != 1)
stop("gamma = ", deparse(substitute(gamma)), " should have exactly one element.")
return((-log(1 - p))^(1/gamma))
}
# random generate from Weibull distribution
rweib <- function(n, gamma = 1) {
if(length(gamma) != 1)
stop("gamma = ", deparse(substitute(gamma)), " should have exactly one element.")
return(qweib(runif(n),gamma))
}
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