try this:
x <- 1:3
y <- matrix(1:12, ncol = 3, nrow = 4)
y * rep(x, each = nrow(y))
I hope it helps.
Best,
Dimitris
On 4/20/2012 10:51 AM, Vincy Pyne wrote:
Dear R helpers
Suppose
x<- c(1:3)
y<- matrix(1:12, ncol = 3, nrow = 4)
y
[,1] [,2] [,3]
[1,] 1 5 9
[2,] 2 6 10
[3,] 3 7 11
[4,] 4 8 12
I wish to multiply 1st column of y by first element of x i.e. 1, 2nd column of
y by 2nd element of x i.e. 2 an so on. Thus the resultant matrix should be like
z
[,1] [,2] [,3]
[1,] 1 10 27
[2,] 2 12 30
[3,] 3 14 33
[4,] 4 16 36
When I tried simple multiplication like x*y, y is getting multiplied column-wise
x*z
[,1] [,2] [,3]
[1,] 1 5 9
[2,] 4 12 20
[3,] 9 21 33
[4,] 16 32 48
Kindly guide
Regards
Vincy
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Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
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