Dave Mason continues his series on matrices in R:

Math operations between matrices is possible too. Here, the same matrix is added to itself. Since it’s the same matrix, they obviously have the same number of elements. The first element is added to the first element, the second element is added to the second element, etc.

> #Add two matrices. > some_numbers + some_numbers [,1] [,2] [,3] [,4] [,5] [,6] [1,] 2 4 6 8 10 12 [2,] 14 16 18 20 22 24 [3,] 26 28 30 32 34 36 [4,] 38 40 42 44 46 48

This follows from Dave’s prior posts, but you can see some of the pieces start to fit together.