[R] Reorder factor and address embedded escapes
eriki at ccbr.umn.edu
Fri Dec 10 21:20:33 CET 2010
Does the following help?
A = c("A\\nB", "C\\nD")
#access levels directly to change names
levels(test$A) <- sub("\\\\n", "\n", levels(test$A))
#re-order levels of the factor
test$A <- relevel(test$A, "C\nD")
Rob James wrote:
> I am trying to reorder a factor variable that has embedded escape
> characters. The data begins as a csv file with a factor that includes
> embedded new line characters. By the time read.table has rendered it
> into a data frame, the variable now has an extra backslash.
> "This\nLabel" in the csv becomes "This\\nLabel" in the data frame.
> So, I am trying to reorder the factor and deal with the introduction of
> a secondary \ . Here's a small example:
> A = c("A\\nB", "C\\nD")
> test <-data.frame(A)
> test$reorderA <-factor(test$A, c("C\\nD", "A\\nB"))
> test$reorderB <-sub("\\\\n", "\n", test$reorderA)
> When sub is applied to the now-correctly ordered factor, it returns to
> the default ordering.
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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