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#ALG: itree copies this direclty from rpart.
#SCCS @(#)rpart.matrix.s 1.6 04/02/01
#
# This differs from tree.matrix in xlevels -- we don't keep NULLS in
# the list for all of the non-categoricals
#
itree.matrix <- function(frame)
{
if(!inherits(frame, "data.frame"))
return(as.matrix(frame))
frame$"(weights)" <- NULL
terms <- attr(frame, "terms")
if(is.null(terms)) predictors <- names(frame)
else {
a <- attributes(terms)
predictors <- as.character(a$variables)[-1L] # R change
removals <- NULL
if((TT <- a$response) > 0L) {
removals <- TT
frame[[predictors[TT]]] <- NULL
}
if(!is.null(TT <- a$offset)) {
removals <- c(removals, TT)
frame[[predictors[TT]]] <- NULL
}
if(!is.null(removals)) predictors <- predictors[ - removals]
labels <- a$term.labels
if(abs(length(labels)-length(predictors))>0)
predictors <- predictors[match(labels,predictors)]
}
factors <- sapply(frame, function(x) !is.null(levels(x)))
characters <- sapply(frame, is.character)
if(any(factors | characters)) {
# change characters to factors
for (preds in predictors[characters])
frame[[preds]] <- as.factor(frame[[preds]])
factors <- factors | characters
column.levels <- lapply(frame[factors], levels)
# Now make them numeric
for (preds in predictors[factors])
frame[[preds]] <- as.numeric(frame[[preds]])
x <- as.matrix(frame)
attr(x, "column.levels") <- column.levels
}
else x <- as.matrix(frame[predictors])
class(x) <- "itree.matrix"
x
}
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