> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of azzza > Sent: Sunday, October 14, 2007 10:21 PM > To: r-help@r-project.org > Subject: [R] Need some help > > > Hi! > I'm taking a course that requires some programming background, but I'm a > complete novice in the field. > > when asked to generate a list of 20 uniform random numbers, is it alright if > I put in >randu, and just copy-paste the first 20 numbers?? Or is there, as > I suspect, a better way of calling out exactly 20 uniform random numbers?? > See ?runif
rand_nums <- runif(20) > I'm also unable to solve the following problem: > We know that on average 30% of the customers who enter a store make a > purchase. Suppose 200 > people enter the store today. Run a simulation to see how many purchases we > will have today. > see ?sample > number_of_purchases <- sum(sample(c(0,1), 200, prob=c(.70, .30), > replace=TRUE)) Hope this is helpful, Dan Daniel Nordlund Bothell, WA USA ______________________________________________ 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.
