Error in dropping columns - invalid argument to unary operator-CodePudding

I have a data frame that has column names like this:

df =

         01.2020   02.2020   03.2020          
11190      4         1          2
12345      3         3          1
11323      1         2          2

both row-names and colnames are numeric

Now, I want to drop column 1 and 3

Code I used:

df <- subset(df, select = -c("02.2020","01.2020"))

But this throws an error:

invalid argument to unary operator

Can anyone give me an alternative of how to drop these columns

CodePudding user response：

Instead of double quotes, use backquotes (or may use the index i.e. -c(1, 3)

subset(df, select = -c(`02.2020`,`01.2020`))

-output

       03.2020
11190       2
12345       1
11323       2

data

df <- structure(list(`01.2020` = c(4L, 3L, 1L), `02.2020` = c(1L, 3L, 
2L), `03.2020` = c(2L, 1L, 2L)), class = "data.frame", row.names = c("11190", 
"12345", "11323"))