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# Copyright (C) 2005 Heather Turner
#
# 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 or 3 of the License
# (at your option).
#
# 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.
#
# A copy of the GNU General Public License is available at
# http://www.r-project.org/Licenses/
pprod <- function(...) {
factorList <- list(...)
nFactors <- length(factorList)
if (nFactors == 0) return(1)
else if (nFactors == 1) return(factorList[[1]])
else {
tryProduct <- try(factorList[[1]] * do.call("Recall", factorList[-1]),
silent = TRUE)
if (inherits(tryProduct, "try-error"))
stop("multiplication not implemented for types of ",
"argument supplied")
else tryProduct
}
}
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