I am posting it here because I am not sure if the behavior described below is actually a bug.
If I do something like this: > x1 <- 1:3 > x2 <- 5:9 > x3 <- 21:27 > ll <- list(x1, x2, x3) > stack(x1,x2,x3) I get the following error: Error in rep.int(names(x), lapply(x, length)) : invalid number of copies in "rep" The problem seems to be that the generic list ll is lacking the names attribute. The stack.default function (in frametools.R) looks like this: > stack.default function (x, ...) { x <- as.list(x) x <- x[unlist(lapply(x, is.vector))] data.frame(values = unlist(unname(x)), ind = factor(rep.int(names(x), lapply(x, length)))) } and the last statement generates an error if names(x) evaluates to NULL. If we add the following line of code before the last statement if(is.null(names(x))) names(x) <- seq(along=x) the stack function will work fine even for "nameless" lists. Andy __________________________________ Andy Jaworski Engineering Systems Technology Center 3M Center, 518-1-01 St. Paul, MN 55144-1000 ----- E-mail: [EMAIL PROTECTED] Tel: (651) 733-6092 Fax: (651) 736-3122 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help