aggregate through across multiple columns in R -

aggregate through across multiple columns in R -

suppose have data.frame called df

x y z 1 2 3 2 3 4 3 4 5 1 3 4 2 4 5

i want

group info x for each sub data.frame, func(df$y, df$z)

how without loop?

you can utilize regular plyr this:

library(plyr) dlply(df, .(x), function(sub_df) func(sub_df$y, sub_df$z)) # or ddply or daply desired

or dplyr:

library(dplyr) df %>% group_by(x) %>% summarize(func(y, z))

or data.table:

library(data.table) df <- as.data.table(df) df[, func(y, z), = x]

r