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

You can use function colSums() to calculate sum of all values. [,-1] ensures that first column with names of people is excluded.

 colSums(people[,-1])
Height Weight 
   199    425

Assuming there could be multiple columns that are not numeric, or that your column order is not fixed, a more general approach would be:

colSums(Filter(is.numeric, people))