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#######################################################################
# arulesViz - Visualizing Association Rules and Frequent Itemsets
# Copyright (C) 2021 Michael Hahsler
#
# 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 of the License, or
# any later version.
#
# 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.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
## mapping helper
map <- function(
x,
range = c(0, 1),
from.range = NA) {
if (is.null(from.range) || any(is.na(from.range))) {
from.range <- range(x, na.rm = TRUE)
}
## check if all values are the same
if (!diff(from.range)) {
if (is.matrix(x)) {
return(matrix(
mean(range),
ncol = ncol(x),
nrow = nrow(x),
dimnames = dimnames(x)
))
} else {
return(structure(rep(mean(range), length(x)), names = names(x)))
}
}
## map to [0,1]
x <- (x - from.range[1])
x <- x / diff(from.range)
## handle single values
if (diff(from.range) == 0) {
x <- 0
}
## map from [0,1] to [range]
if (range[1] > range[2]) {
x <- 1 - x
}
x <- x * (abs(diff(range))) + min(range)
x[x < min(range) | x > max(range)] <- NA
x
}
map_int <- function(
x,
range = c(1, 100),
from.range = NA) {
floor(map(x, c(range[1], range[2] + .9), from.range))
}
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