Sum all values in every column of a data.frame in R

Question

Given this data set:

  Name Height Weight
1 Mary     65    110
2 John     70    200
3 Jane     64    115

I\'d like to sum every qualifier c

Answer 1

We can use dplyr to select only numeric columns and purr to get sum for all columns. (can be used to get what ever value for all columns, such as mean, min, max, etc. )

library("dplyr")
library("purrr")

people %>%
    select_if(is.numeric) %>%
    map_dbl(sum)

Or another easy way by only using dplyr

library("dplyr")
people %>%
    summarize_if(is.numeric, sum, na.rm=TRUE)