On Wed, 30 Nov 2022 13:40:50 +0100
Luigi Marongiu <marongiu.luigi at gmail.com> wrote:
Hello, I have a data frame where some lines containing strings including digits. How do I select those rows and change their values? In essence, I have a data frame with different values assigned to the column "val". I am formatting everything to either "POS" and "NEG", but values entered as number should get the value "NUM". How do I change such values?
What I do in such circumstances:
suppressWarnings(X$val[!is.na(as.numeric(X$val))] <- "NUM")
The "suppressWarnings()" bit is just included due to my OCD.
This avoids fooling about with regular expressions, which always
requires a huge amount of trial and error, and a great diminishment of
the amount of hair on one's head (as a result of tearing out).
Note that I have changed the name of your data frame from "df" to "X",
since df() is a built-in R function (density of the F-distribution).
See fortunes::fortune("might clash").
cheers,
Rolf Turner
Honorary Research Fellow Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276