A <- matrix(c(2,3,-2,1,2,2),3,2) A
## [,1] [,2] ## [1,] 2 1 ## [2,] 3 2 ## [3,] -2 2
c <- 3 c*A
## [,1] [,2] ## [1,] 6 3 ## [2,] 9 6 ## [3,] -6 6