On Nov 8, 2007, at 12:07 PM, shweta wrote: > Hi , > > I was trying to generate random data in R using the runif function. > But > I am not sure how do I combine the x and y to get a 2d array/matrix > in a > variable z. > As seen below I am getting the same numbers in x as 1 and in y as 2.1 > respectively. I would like to get different & random numbers in x & y. > > Please let me know.
Looking at ?runif, you can see that the syntax for runif is: runif(n, min=0, max=1) So when you call runif(N,1), what you really call is runif (N,min=1,max=1), so you are asking R to generate random numbers between 1 and 1. Of course they will all be equal to 1. Try runif(N), or specify both a min and a max. PS: Not sure what this has to do with GUI though, isn't that more appropriate to R-help instead of r-sig-gui? > x <- array(runif(N,1),dim=c(N,1)) >> x > [,1] > [1,] 1 > [2,] 1 > [3,] 1 > [4,] 1 > [5,] 1 > [6,] 1 > [7,] 1 > [8,] 1 > [9,] 1 > [10,] 1 >> y <- array(2*x + runif(N,1)/10) >> y > [1] 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 > > Thanks & Regards, > Shweta. Haris Skiadas Department of Mathematics and Computer Science Hanover College _______________________________________________ R-SIG-GUI mailing list R-SIG-GUI@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-gui
