On 18/06/2016 6:12 PM, Naresh Gurbuxani wrote:
I want to calculate a function many times over. My solution below works, but does not seem very elegant.# my function to run many times over stud.score <- function(n.questions, mult.choice = 2) { prob.success <- 1 / mult.choice answers <- (runif(n.questions) < prob.success) return(sum(answers)) } # my method to run above function 1000 times and store results count.df <- data.frame(n.count = rep(10, 1000)) scores.df <- apply(count.df, 1, function(x) return(stud.score(x))) Creating a data frame just to repeat the the count seems wasteful. How can I generate scores.df without count.df? Thanks,
You don't need a data frame or a loop at all. You're simulating binomial values, and R has rbinom() to do that in a vectorized way.
Duncan ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
