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#############################################################################
# Copyright (c) 2014 Mathieu Ribatet
#
# 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 2 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, write to the
# Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
#
#############################################################################
##Little functions that computes return period from non exceedance
##probability and viceversa
rp2prob <- function(retper, npy){
##retper : the return period
##npy : the mean Number of events Per Year
if (any(npy <=0))
stop("``npy'' must be positive !!!")
if (any(retper < 1/npy))
stop("return period incompatible with ``npy'' !!!")
prob <- 1 - 1/(npy * retper)
tab <- cbind(npy = npy, retper = retper, prob = prob)
rownames(tab) <- 1:length(tab[,1])
return(tab)
}
prob2rp <- function(prob, npy){
##prob : the probability of non exceedance
##npy : the mean (N)umber of events (P)er (Y)ear
if (any(npy <=0))
stop("``npy'' must be positive !!!")
if (any(prob <0) | any(prob >= 1) )
stop("``prob'' must be in [0,1) !!!")
retper <- 1 / (npy * (1 - prob))
tab <- cbind(npy = npy, retper = retper, prob = prob)
rownames(tab) <- 1:length(tab[,1])
return(tab)
}
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