Nothing
# check the method used to discretize the data.
check.discretization.method = function(method) {
if (!missing(method) && !is.null(method)) {
check.label(method, choices = available.discretization.methods,
labels = discretization.labels, argname = "discretization method",
see = "discretize")
return(method)
}#THEN
else {
return("quantile")
}#ELSE
}#CHECK.DISCRETIZATION.METHOD
# sanitize the extra arguments passed to discretization methods.
check.discretization.args = function(method, data, breaks, extra.args) {
# check which type of data we are dealing with.
type = data.type(data)
# check the initial discretization algorithm.
if (has.argument(method, "idisc", discretization.extra.args))
extra.args[["idisc"]] = check.idisc(extra.args[["idisc"]])
# check the initial number of breaks.
if (has.argument(method, "ibreaks", discretization.extra.args))
extra.args[["ibreaks"]] =
check.ibreaks(extra.args[["ibreaks"]], breaks = breaks, data = data)
# warn about and remove unused arguments.
extra.args = check.unused.args(extra.args, discretization.extra.args[[method]])
return(extra.args)
}#CHECK.DISCRETIZATION.ARGS
# check the initial discretization algorithm.
check.idisc = function(idisc) {
if (!is.null(idisc)) {
other.methods = setdiff(available.discretization.methods, "hartemink")
check.label(idisc, choices = other.methods, labels = discretization.labels,
argname = "initial discretization method", see = "discretize")
}#THEN
else {
# default to quantile discretization as per Hartemink's recommendation.
idisc = "quantile"
}#ELSE
return(idisc)
}#CHECK.IDISC
# check the initial number of breaks.
check.ibreaks = function(ibreaks, breaks, data) {
if (!is.null(ibreaks)) {
if (length(ibreaks) == 1)
ibreaks = rep(ibreaks, ncol(data))
else if (length(ibreaks) != ncol(data))
stop("the 'ibreaks' vector must have an element for each variable in the data.")
if (!is.positive.vector(ibreaks))
stop("the number of initial breaks must be a (vector of) positive integer number(s).")
if (any(ibreaks < breaks))
stop("insufficient number of initial breaks, need at least ", breaks + 1, ".")
else if (any(ibreaks == breaks))
warning("the initial number of breaks is identical to the final number of breaks.")
}#THEN
else {
ndata = nrow(data)
if (ndata > 500)
ibreaks = 50
else if (ndata > 100)
ibreaks = 20
else if (ndata > 50)
ibreaks = 10
else if (ndata > 10)
ibreaks = 5
else
ibreaks = ndata
ibreaks = rep(ibreaks, ncol(data))
}#ELSE
return(ibreaks)
}#CHECK.IBREAKS
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