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# Based on http://opensource.org/licenses/BSD-2-Clause
#
# YEAR: 2013
# COPYRIGHT HOLDER: Alfredo Kalaitzis
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.boundedTransform <-
function (x, transform="atox", bounds) {
eps <- 2.2204e-16
thre <- 36 ## threshold
y <- array(0, dim(as.array(x)))
if ( "atox" == transform ) {
for ( ind in seq_along(as.array(x)) ) {
if ( x[ind] > thre )
y[ind] <- 1-eps
else if ( x[ind] < -thre )
y[ind] <- eps
else
y[ind] <- 1/(1+exp(-x[ind]))
}
y <- (bounds[2] - bounds[1])*y + bounds[1]
} else if ( "xtoa" == transform ) {
x <- (x - bounds[1]) / (bounds[2] - bounds[1])
for ( ind in seq_along(as.array(x)) ) {
y[ind] <- .complexLog(x[ind]/(1-x[ind]))
}
} else if ( "gradfact" == transform ) {
y <- (x-bounds[1])*(1-(x-bounds[1])/(bounds[2] - bounds[1]))
}
return (y)
}
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