Rolf Turner wrote: > > On 16/10/2008, at 12:28 AM, Henrique Dallazuanna wrote: > >> Try this: >> >> lapply(1:n, rnorm) > > That has nothing to do with what the inquirer *asked*. > probably because it's not what the inquirer knew he *should* have asked. it does solve the task he used as an example in a way far better then the imperative-style sequence of assignments (no intention to criticize your intro to lists, just that it should not be taken as a generally superior solution). and it can probably be used as a pattern for the real problem he wanted to solve.
vQ >> >> On Wed, Oct 15, 2008 at 8:19 AM, Megh Dal <[EMAIL PROTECTED]> wrote: >> >>> Can anyone please tell me how to define a "list". Suppose I want to >>> define >>> a list object "result" with length n then want to fill each place of >>> "result" with different objects. For e.g. >>> >>> i=1 > > Why have you set i=1? You make no use at all of ``i''!!! > >>> result[1] = rnorm(1) >>> >>> i=2 >>> result[2] = rnorm(2) >>> >>> ....................... >>> >>> i=n >>> result[n] = rnorm(n) >>> >>> What would be the best way to do that? > > Simply start off with > > result <- list() > > Then you can do > > result[[1]] <- rnorm(1) > result[[2]] <- rnorm(2) > result[[42]] <- "a load of dingos' kidneys" > > Note 1: This will result in a list of length (at this stage) 42. > Entries 3 to 41 inclusive of this list will be NULL. > > Note 2: Use the ***double*** brackets! The distinction is that > if result is a *list* then > > result[1] is a ***list*** of length 1, the sole entry of that > list being the first entry of result > > result[[1]] is the first entry of result, pure and simple. > > If you tried > > result[2] <- rnorm(2) > > you'd get a warning message about the wrong number of items to replace > (you have tried to assign something of length 2 to something of length 1) > and result[[2] would contain only the first entry of the vector rnorm(2). > > cheers, > > Rolf Turner > > ###################################################################### > Attention:\ This e-mail message is privileged and confid...{{dropped:9}} > > ______________________________________________ > 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. ______________________________________________ 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.