Kevin Zembower wrote: > > I'm trying to get R to simulate the sum of the values on 10 fair dice > (yes, it's related to a homework problem, but is not the problem > itself). I tried to do this: > > rep(sum(sample(1:6,100,replace=T)), times=10) > [1] 341 341 341 341 341 341 341 341 341 341 > rep(stuff, times=10) will just take stuff and repeat 10 times. stuff is constant (but every time you repeat that line you get a different stuff to be repeated), so you get a vector of 10 equal numbers.
> I overcome this, so that I get a vector of values that correspond to > independent throws of 10 dice each time? > # get 10*100 random d6s x <- sample(1:6, 10*100, replace=T) # transform into a 10 x 100 matrix y <- matrix(x, 10, 100) # sum the cols z <- colSums(y) Of course, you can combine these three lines into one. Alberto Monteiro ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
