在 R 中，如何在列名中包含正斜杠？

Question

While creating my data.frame, I want one of my columns to include a '/' in the column name. When I try to put it in normally, when I check my object, the '/' is replaced by a period. Here is the code I am working with. My problem is with the 'S/NS' column.

df_3 <- data.frame(age=numeric(7800),
                 duration=numeric(7800), 
                 value=numeric(7800),
                 'S/NS'=character(7800),
                 sex=character(7800),
                 stringsAsFactors=FALSE)

head(df_3) gives me the following output.

age duration value S.NS sex
1   0        0     0         
2   0        0     0         
3   0        0     0         
4   0        0     0         
5   0        0     0         
6   0        0     0 

What I intended was for the column "N.NS" to appear as "N/NS" (smoking/non-smoking). I have tried fiddling around with the quotation marks, putting in a backslash escape before the forward slash, and some fruitless google searches. Thanks in advance.

Answer 1

You can use check.names = F to disable name checking:

df_3 <- data.frame(age=numeric(7800),
                   duration=numeric(7800), 
                   value=numeric(7800),
                   'S/NS'=character(7800),
                   sex=character(7800),
                   stringsAsFactors=FALSE,check.names = F)

> colnames(df_3)
[1] "age"      "duration" "value"    "S/NS"     "sex"