r data table sum columns by row code example

Example 1: sum columns r

colSums (x, na.rm = FALSE, dims = 1)
rowSums (x, na.rm = FALSE, dims = 1)
colMeans(x, na.rm = FALSE, dims = 1)
rowMeans(x, na.rm = FALSE, dims = 1)

Example 2: how to get sum of rows and columns of a matrix in R

#Suppose x is a matrix
x<-matrix()

#Vector of Row sums of x
rowSums(x)
#Vector of Col sums of x
colSums(x)