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###################################################################
# R2Cuba R package
# Copyright INRA 2015
# INRA, UR1404, Research Unit MaIAGE
# F78352 Jouy-en-Josas, France.
#
# This file is part of R2Cuba R package, interface between R and
# the Cuba library.
# R2Cuba URL: http://cran.r-project.org/web/packages/R2Cuba
# Cuba library URL: http://www.feynarts.de/cuba
# R2Cuba 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
# 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.
#
# See the GNU General Public License at:
# http://www.gnu.org/licenses/
#
###################################################################
divonne <- function(ndim, ncomp,
integrand, ...,
lower=rep(0,ndim), upper=rep(1,ndim),
rel.tol= 1e-3,
abs.tol = 0,
flags=list(verbose=1,
final=1, pseudo.random=0,
mersenne.seed=NULL),
min.eval=0, max.eval=50000,
key1=47,
key2=1, key3=1,
max.pass=5, border=0, max.chisq=10,
min.deviation=0.25,
xgiven=NULL, nextra=0,
peakfinder=NULL)
{
# Verification
if (!verif(ndim, ncomp, lower, upper, rel.tol, abs.tol,
flags, min.eval, max.eval))
stop("Error in input: see the warnings")
# Decode the flags
lesflags <- decodflags(flags)
if (is.null(flags$mersenne.seed))
flags$mersenne.seed <- NA
# xgiven dimensions:
if (!is.null(xgiven)) {
if (!is.matrix(xgiven))
stop("xgiven should be a matrix")
ngiven <- ncol(xgiven)
ldxgiven <- nrow(xgiven)
if (ldxgiven != ndim)
stop("Matrix xgiven should have ndim rows")
# Scale xgiven in the unit hypercube
for (i in 1:ndim) {
xgiven[i,] <- xgiven[i,]/(upper[i]-lower[i])
}
}
else {
ngiven=0; ldxgiven=ndim
}
if (nextra <0)
stop("nextra should be positive or zero")
if ((nextra >0) && is.null(peakfinder))
stop("nextra positive but not peakfinder subroutine")
if ((nextra==0) && !is.null(peakfinder))
warning("peakfinder ignored: nextra is zero")
# 6/6/2012
if (is.null(peakfinder))
peakfinder=0
# Allocate outputs
nregions <- 0
neval <- 0
fail <- 0
integral <- rep(0, ncomp)
error <- rep(0, ncomp)
prob <- rep(0, ncomp)
libargs <- c("ndim", "ncomp",
"integrand","lower", "upper",
"rel.tol", "abs.tol", "flags",
"min.eval","max.eval", "key1",
"key2", "key3",
"max.pass", "border", "max.chisq",
"min.deviation", "xgiven", "nextra",
"peakfinder")
ffintegrand <- crff(match.call(), integrand, "divonne", libargs, ...)
prdbounds <- prod(upper-lower)
ret <- .C("Rdivonne", as.integer(ndim),
as.integer(ncomp),
ffintegrand, new.env(),
as.double(lower), as.double(upper),as.double(prdbounds),
as.double(rel.tol), as.double(abs.tol),
as.integer(flags$mersenne.seed),
as.integer(lesflags),
as.integer(min.eval), as.integer(max.eval),
as.integer(key1), as.integer(key2), as.integer(key3),
as.integer(max.pass), as.double(border),
as.double(max.chisq), as.double(min.deviation),
as.integer(ngiven), as.integer(ldxgiven),
as.double(xgiven), as.integer(nextra),
peakfinder,
nregions=as.integer(nregions),
neval=as.integer(neval), fail=as.integer(fail),
integral=as.double(integral),
error=as.double(error), prob=as.double(prob),
NAOK=TRUE)
#Add to finish the last print:cat("\n")
# To homogeneize with the R function "integrate", add
# message and call into the output,
# ifail rather than fail , abs.error rather than error,
# value rather than integral
if (ret$fail ==0)
mess ="OK" # OK required to be printed by print.cuba
else
mess="Dimension out of range"
retour <- list(method="divonne",
neval=ret$neval, nregions=ret$nregions,
ifail=ret$fail, value=ret$integral,
abs.error=ret$error,
neval=ret$neval,
prob=ret$prob, message=mess,
call=match.call())
attr(retour, "class") = c("cuba")
return(retour)
} # End divonne
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