search for: pl_sum

Since I read digests, and don't read mail on weekends, I come to this discussion late. It was very entertaining. I only wish to comment on 2 points. The first is Henrich's (I believe) one that trying to convert an old-time user to new styles is futile. I agree wholeheartedly. As proof I offer the survival suite --anyone who peruses it will notice a different indentation rule for

Hi, I wonder if someone can suggest how to create a new data.frame Y from X where X$PL_Pos is summed by each unique X$MyDate. Y should end up with two (or more) columns Y$MyDate and Y$PL_Sum with its value being the cumsum of all the values in X for that date. - a 'daily cumsum'. Thanks, Mark TStoDate = function (TSDate) { X = strptime(TSDate + 19e6L, "%Y%m%d") return(as.Date(X)) } X = structure(list(EnDate = c(1090803, 1090804, 1090805, 1090806, 1090806, 109081...