Erik- thank you very much. The rbinom worked. Thanks ! GR
________________________________ From: Erik Iverson-3 [via R] <ml-node+2994186-584049527-199...@n4.nabble.com> Sent: Wed, October 13, 2010 2:24:18 PM Subject: Re: Coin Toss Simulation Shiv wrote: > I am trying a simple toin coss simulation, of say 200 coin tosses. The idea > is to have a data frame like so: > Experiment# Number_Of_Heads > 1 104 > 2 96 > 3 101 > > So I do: > > d <-data.frame(exp_num=c(1,2,3)); /* Just 3 experiments to begin with */ > d$head_ct <-sum(sample(0:1,200,repl=TRUE)); /* */ is not a valid comment in R, and you don't need ';' either :) Just try evaluating the right hand side so that the R interpreter prints the result. This is just calling sample once, and therefore you only get one number, 85 in your case. > d; > exp_num head_ct > 1 1 85 > 2 2 85 > 3 3 85 /* the same scalar value is > applied to all the rows */ > > So I tried using "within", and "for", and making the "sum( " as a > function, and I end up with the same...I get the same constant value. But > what I want of course is different "samples".... Look at ?replicate or just use ?rbinom directly d <-data.frame(exp_num = 1:3) d$head_ct <- rbinom(nrow(d), 200, prob = 0.5) > > > ______________________________________________ [hidden email] 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. ________________________________ View message @ http://r.789695.n4.nabble.com/Coin-Toss-Simulation-tp2994088p2994186.html To unsubscribe from Coin Toss Simulation, click here. -- View this message in context: http://r.789695.n4.nabble.com/Coin-Toss-Simulation-tp2994088p2994284.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] ______________________________________________ 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.
