I got the whole thing to work, with Hadley Wickham's help. is.POSIXt <- function(x) inherits(x, "POSIXt") dates <- sapply(df, is.POSIXt) df[dates] <-lapply(df[dates], as.Date)
Farrel Buchinsky On Fri, Dec 12, 2008 at 11:26, Farrel Buchinsky <fjb...@gmail.com> wrote: > > Something strange. The lapply only processed the first row and then wrote > that value to every row of the original dataframe. It is as if the lapply is > indeed processing every item on the list, namely each column, but the ifelse > or the as.Date is getting messed up. Not only is it only processing the first > row but it is also returning the value as numbers rather than dates. I am now > playing around with Hadley Wickham's plyr package. So far looking good but > still need to work out a few things. ______________________________________________ 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.
