Nothing
rename <-
function(data, from, to) {
# get name of data table
df.name <- deparse(substitute(data))
# if a tibble convert to data frame
dfs <- .getdfs()
if (!is.null(dfs)) {
if (df.name %in% dfs) { # tibble to df
if (any(grepl("tbl", class(data), fixed=TRUE))) {
data <- data.frame(data)
}
}
}
# get existing, old variable name from its position in data frame
data.vars <- as.list(seq_along(data))
names(data.vars) <- names(data)
ind.fr <- eval(substitute(from), envir=data.vars, parent.frame())
nm.fr <- names(data)[ind.fr]
# new variable name(s)
# if converting a vector of names, then first element is "c", so remove
nm.new <- sapply(substitute(to), deparse)
nm.to <- character(length=0)
if (length(nm.new) > 1)
for (i in 2:length(nm.new)) nm.to[i-1] <- nm.new[i]
else
nm.to <- nm.new[1]
if (length(ind.fr) > 0) {
for(i in 1:length(ind.fr))
names(data)[names(data) == nm.fr[i]] = nm.to[i]
}
cat("Change the following variable names for data frame", df.name, ":\n\n")
for (i in 1:length(nm.fr))
cat(nm.fr[i], "-->", nm.to[i], "\n")
cat("\n")
return(data)
}
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