Nothing
preclean <- function(x, targetColumns, dirt) {
if (is.numeric(targetColumns)) {
if (any(targetColumns < 1)) {
stop("Only positive column numbers are allowed.\n")
}
if (any(targetColumns > dim(x)[2])) {
nx <- deparse(substitute(x))
stop("Column numbers exceed dimension of x (", nx, ").\n", sep="")
}
targetColumns <- colnames(x)[targetColumns]
}
if (!all(targetColumns %in% colnames(x))) {
warning("Will skip unknown column names.\n")
}
for (target in targetColumns) {
if (!(target %in% colnames(x))) {
cat("\tSkipping '", target, "'\n", sep="", file=stderr())
}
vec <- x[,target]
for (smudge in dirt) {
vec <- gsub(smudge, "", vec, fixed = TRUE)
}
x[,target] <- vec
}
x
}
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