Aggregate by NA in R

Question

Does anybody know how to aggregate by NA in R.

If you take the example below

a <- matrix(1,5,2)
a[1:2,2] <- NA
a[3:5,2] <- 2
aggregate(a[,1]         


        

Answer 1

Use summarize from dplyr

library(dplyr)

a %>%
  as.data.frame %>%
  group_by(V2) %>%
  summarize(V1_sum = sum(V1))