How to generate for one vector matrix
On Thu, 2005-10-13 at 19:47 +0200, Jan Sabee wrote:
Is there any routine to generate for one vector matrix. If I have X I want to generate start from zero to maximum value each vector. For example, I have a vector x = (4,2,3,1,4) I want to generate n=6 times, for 4, start 0 to 4, then 2 start 0 to 2, ect. The result something like this: generate(x,n=6) 1,1,2,1,4 1,2,3,0,3 4,0,1,1,1 3,1,0,1,4 0,0,3,0,0 4,1,3,0,4 Could anyone help me. Thanks. Regards, Jan Sabee
If I am properly understanding what you are doing here, you have an initial vector of values. You want to create a matrix, whose columns are the result of random sampling with replacement from the initial vector 'n' times, where the sampling space for each column "i" is from 0:x[i]? If correct, this should do it:
x <- c(4, 2, 3, 1, 4)
x
[1] 4 2 3 1 4
sapply(x, function(x) sample(0:x, 6, replace = TRUE))
[,1] [,2] [,3] [,4] [,5] [1,] 4 2 1 1 2 [2,] 3 0 0 0 0 [3,] 1 2 0 1 3 [4,] 4 2 1 1 1 [5,] 3 1 3 1 0 [6,] 0 1 1 1 0 Just replace '6' in the sample() arguments with the 'n' you require. See ?sapply and ?sample. HTH, Marc Schwartz