# Copyright (C) 2005 David Firth
#
# 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/
"Topo" <-
function (..., spec = NULL)
{
if (is.null(spec)) stop("No spec given")
dots <- list(...)
factorLengths <- vapply(dots, length, 1)
lengthsEqual <- {if (length(factorLengths) == 1) TRUE else
sd(factorLengths) == 0}
if (!lengthsEqual) stop("Factors have different lengths")
specDim <- if (is.vector(spec)) length(spec) else dim(spec)
dots <- lapply(dots, as.factor)
facMat <- cbind(...)
spec.ok <- identical(vapply(dots, nlevels, 1L), specDim)
if (!spec.ok) stop(
"Dimensions of spec do not match the factor arguments")
return(as.factor(spec[facMat]))
}
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