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#########################################################################/**
# @RdocDefault isZero
#
# @title "Checks if a value is (close to) zero or not"
#
# @synopsis
#
# \description{
# Checks if a value (or a vector of values) is (close to) zero or not
# where "close" means if the absolute value is less than \code{neps*eps}.
# \emph{Note that \code{x == 0} will not work in all cases.}
#
# By default \code{eps} is the smallest possible floating point value
# that can be represented by the running machine, i.e.
# \code{.Machine$double.eps} and \code{neps} is one.
# By changing \code{neps} it is easy to adjust how close to zero "close"
# means without having to know the machine precision (or remembering how
# to get it).
# }
#
# \arguments{
# \item{x}{A @vector of values.}
# \item{eps}{The smallest possible floating point.}
# \item{neps}{A scale factor of \code{eps} specifying how close to zero
# "close" means. If \code{eps} is the smallest value such that
# \code{1 + eps != 1}, i.e. \code{.Machine$double.eps}, \code{neps} must
# be greater or equal to one.}
# \item{...}{Not used.}
# }
#
# \value{Returns a @logical @vector indicating if the elements are zero or not.}
#
# @author
#
# \seealso{
# @see "base::all.equal".
# @see "base::Comparison".
# \code{\link[base:zMachine]{.Machine}}.
# }
#
# @examples "../incl/isZero.Rex"
#
# @keyword "logic"
#*/#########################################################################
setMethodS3("isZero", "default", function(x, neps=1, eps=.Machine$double.eps, ...) {
if (is.character(eps)) {
eps <- match.arg(eps, choices=c("double.eps", "single.eps"))
if (eps == "double.eps") {
eps <- .Machine$double.eps
} else if (eps == "single.eps") {
eps <- sqrt(.Machine$double.eps)
}
}
(abs(x) < neps*eps)
})
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