Group by multiple columns and sum other multiple columns

Question

I have a data frame with about 200 columns, out of them I want to group the table by first 10 or so which are factors and sum the rest of the columns.

I have list of

Answer 1

The dplyr way would be:

library(dplyr)
df %>%
  group_by(col1, col2, col3) %>%
  summarise_each(funs(sum))

You can further specify the columns to be summarised or excluded from the summarise_each by using the special functions mentioned in the help file of ?dplyr::select.