Okay... I would like to have some elegant (writting generic R code) solution to do following.
I have a dataset X1 X2 X3 X4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 I would like to specify sometnig like this: windows <- c(3, 4); functions <- c(min, max); columns <- c(X1, X2); and to get resulting data frame with following columns.... X1, X2, X3, X4, minX1(previous 3 obs.), minX1(previous 4 obs.), minX2(previous 3 obs.), minX2(previous 4 obs.), maxX1(previous 3 obs.), maxX1(previous 4 obs.), maxX2(previous 3 obs.), maxX2(previous 4 obs.) I'm guessing that it should be based on apply function... Thnaks ______________________________________________ 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.
