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# Copyright (c) 2019 - 2023, Adrian Dusa
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, in whole or in part, 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.
# * The names of its contributors may NOT be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# 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 ADRIAN DUSA 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.
`getMatrix` <- function(noflevels, depth = 0) {
nofconds <- length(noflevels)
pwr <- unique(noflevels)
if (length(pwr) == 1) {
create <- function(idx) {
rep.int(c(sapply(seq_len(pwr) - 1, function(x) rep.int(x, pwr^(idx - 1)))),
pwr^nofconds/pwr^idx)
}
retmat <- sapply(rev(seq_len(nofconds)), create)
} else {
mbase <- c(rev(cumprod(rev(noflevels))), 1)[-1]
orep <- cumprod(rev(c(rev(noflevels)[-1], 1)))
retmat <- sapply(seq_len(nofconds), function(x) {
rep.int(rep.int(seq_len(noflevels[x]) - 1, rep.int(mbase[x], noflevels[x])), orep[x])
})
}
if (is.vector(retmat)) {
retmat <- matrix(retmat, nrow = 1)
}
if (depth > 0) {
retmat <- retmat[apply(retmat, 1, function(x) sum(x > 0) <= depth ), , drop = FALSE]
}
return(retmat)
}
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