See ?expand.grid For example, df <- expand.grid(L=L, AR=AR, SO=SO, T=T) df$y <- fun(df$L, df$AR, df$SO, df$T)
Jean Johannes Radinger wrote on 01/13/2012 12:28:46 PM: > Hello, > > probably it is quite easy but I can get it: I have > mulitple numeric vectors and a function using > all of them to calculate a new value: > > L <- c(200,400,600) > AR <- c(1.5) > SO <- c(1,3,5) > T <- c(30,365) > > fun <- function(L,AR,SO,T){ > exp(L*AR+sqrt(SO)*log(T)) > } > > How can I get an array or dataframe where > all possible combinations of the factors are listed > and the new value is calculated. > > I thought about an array like: > array(NA, dim = c(3,1,3,2), dimnames=list(c(200,400,600),c(1.5),c(1, > 3,5),c(30,365))) > > but how can I get the array populated according to the function? > > As I want to get in the end a 2D dataframe I probably will use the > melt.array() > function from the reshape package or is there another way to get simple such > a "full-factorial" dataframe with all possible combinations? > > Best regards, > Johannes [[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.