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# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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 Library General Public License for more details.
#
# You should have received A copy of the GNU Library General
# Public License along with this library; if not, write to the
# Free Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
################################################################################
# FUNCTION: DESCRIPTION:
# .unirootNA Computes zero of a function without error exit
################################################################################
.unirootNA <-
function(f, interval, lower = min(interval), upper = max(interval),
tol = .Machine$double.eps^0.25, ...)
{
# A function implemented by Diethelm Wuertz
# Description:
# Searches the interval from lower to upper for a
# root (i.e., zero) of the function f with respect
# to its first argument.
# Arguments:
# see 'uniroot'
# Value:
# Returns the x value of f where the root is located. If
# now root exists NA will be returned. In the last case
# the function doesn't terminate with an error like in the
# case of the standard function uniroot.
# Details:
# R:
# uniroot(f, interval, lower = min(interval), upper = max(interval),
# tol = .Machine$double.eps^0.25,
# maxiter = 1000, ...)
# uniroot(f, interval, lower = min(interval), upper = max(interval),
# tol = .Machine$double.eps^.25,
# keep.xy = F, f.lower = NA, f.upper = NA, ...)
# Example:
# .unirootNA(sin, c(1, 2)); .unirootNA(sin, c(-1, 1))
# FUNCTION:
# There is no Root:
if (is.null(args(f))) {
if (f(lower) * f(upper) >=0) return(NA)
} else {
if (f(lower, ...) * f(upper, ...) >= 0) return(NA)
}
# There is a Root:
ans = uniroot(f = f, interval = interval, lower = lower,
upper = upper, tol = tol, ...)
# Return Value:
ans$root
}
################################################################################
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