Coursera - R Programming - Week 1 - Vectorized Operations

    > x <- 1:4, y <- 6:9
    > x + y
    [1] 7 9 11 13
    > x > 2
    [1] FALSE FALSE TRUE TRUE
    

Vectorized Matrix Operations

    > x <- matrix(1:4, 2, 2); y <- matrix(rep(10, 4), 2, 2)
    

rep creates a 2x2 matrix of 10s

True matrix multiplication is performed using %*%:

    > x %*% y
    \t[ ,1]\t[ ,2]
    [1, ]\t40\t40
    [2, ]\t60\t60