Message-Id: <199711021430.OAA128446@out2.ibm.net> From: "Brent Hutto" <BHutto@IBM.Net> To: r-help@stat.math.ethz.ch Date: Sun, 2 Nov 1997 09:30:40 +0000 Subject: R-beta: A vector of lists == Data Frame? I hope a very basic R/S programming question is appropriate for this list... I have a function which returns a list of several (named) numeric values characterising an event history for a person. I want to invoke the function many (1000) times and create a vector of these lists to represent the histories of a population. At first, I thought that a data frame would be the appropriate way to store the whole population record. But upon some reading in "Modern Applied Statistics with S-plus" (Venables and Ripley, 1994) it seems that a data frame is more like a list of vectors (all of the same length) than a vector of lists. What is the most common R/S idiom for creating a vector of lists and then adding new lists to it? To be more specific, if "CreatePerson" is a function that returns a list characterising that person, how do I implement the following pseudo-code in R Person[ i ] <- CreatePerson( param1, param2 ) Where Person[ 1000 ] is a vector of lists of the type returned by the "CreatePerson" function? When I'm done, I want to do things like the following pseudo-code Person[ j ]$Age <- Person[ j ]$Age + 1 or similar (actually, that particular piece of logic isn't necessarily one I'm likely to do). Any guidance is appreciated as are suggestions for a text to supplement Venables and Ripley in learning this language from scratch. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request@stat.math.ethz.ch =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=