data manipulation between vector and matrix
Hi,
On Wed, Dec 5, 2012 at 1:30 PM, C W <tmrsg11 at gmail.com> wrote:
Dear list, I was curious how to subtract a vector from matrix? Say, I have mat <- matrix(1:40, nrow=20, ncol=2) x <-c(1,2)
Thanks for the actual reproducible example.
I want, x-mat[1,] and x-mat[2,], and so on... Basically, subtract column elements of x against column elements in mat. But x-mat won't do it.
This will (note the modification to get x - mat):
sweep(-mat, 2, x, "+")
[,1] [,2] [1,] 0 -19 [2,] -1 -20 [3,] -2 -21 [4,] -3 -22 [5,] -4 -23 etc. -- Sarah Goslee http://www.functionaldiversity.org