如何计算两个数据帧的元素商？

Question

> A <- data.frame(x = c(1,2,3), y = c(4,5,6), z = c(7,8,9))
> B <- data.frame(x = c(1,1,1), y = c(2,2,2), z = c(3,3,3))
> A
  x y z
1 1 4 7
2 2 5 8
3 3 6 9
> B
  x y z
1 1 2 3
2 1 2 3
3 1 2 3

What I would like to do is calculate a new data frame C which is the defined as:

C[i,j] := A[i,j] / B[i,j]

for all coordinates i,j possible.

Is there a clean and quick way to do it without resorting to loops and without referencing individual columns or rows ?

(Application of data.table, plyr is fine)

Answer 1

Simple: do A/B :

R> C <- A/B
R> C
  x   y       z
1 1 2.0 2.33333
2 2 2.5 2.66667
3 3 3.0 3.00000
R> 

R really is a vectorised language.