Às 12:40 de 30/11/2022, Luigi Marongiu escreveu:
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?
Hello,
Here is a way with grep.
i <- grep("^P|^Y", df$val, ignore.case = TRUE)
df$val[i] <- "POS"
i <- grep("^N", df$val, ignore.case = TRUE)
df$val[i] <- "NEG"
i <- grep("\\d+", df$val)
df$val[i] <- "NUM"
is.na(df$val) <- df$val == ""
df
Hope this helps,
Rui Barradas
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