Add row to data frame with dplyr

Question

I have this sample data:

cvar <- c(\"2015-11-01\",\"2015-11-02\",\"All\")
nvar1 <- c(12,10,5)
nvar2 <- c(7,5,6)
data <- cbind.data.frame(cvar,nvar1,n         


        

Answer 1

Using only dplyr you could do the following

data %<>%
  summarise(cvar = "add",
            nvar1 = sum(nvar1),
            nvar2 = sum(nvar2)) %>%
  bind_rows(data)

which results in

        cvar nvar1 nvar2
1        add    27    18
2 2015-11-01    12     7
3 2015-11-02    10     5
4        All     5     6

Note that this way the new row is added at the beginning rather than the end of the original dataframe.

If you want to add the new row at the end instead, use the following code (thanks to krlmlr for pointing this out)

data %<>%
  summarise(cvar = "add",
            nvar1 = sum(nvar1),
            nvar2 = sum(nvar2)) %>%
  bind_rows(data, .)

which results in

        cvar nvar1 nvar2
1 2015-11-01    12     7
2 2015-11-02    10     5
3        All     5     6
4        add    27    18