add column to matrix r 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: add row to matrix r

MatrixB <- rbind(MatrixA, c(10,11,12))