Dear all, I'd like to have a dataframe store information about the units of the data it contains.
You'll find below a minimal exemple of the way I do, so far. I add a "units" attribute to the dataframe. But I dont' like the long syntax needed to access to the unit of a given variable (namely, something like : var_unit <- attr(my_frame, "units")[[match(var_name, attr(my_frame, "names"))]] Can anybody point me to a better solution ? Thanks in advance, Bruno. # Dataframe creation x <- c(1:10) y <- c(11:20) z <- c(101:110) my_frame <- data.frame(x, y, z) attr(my_frame, "units") <- c("x_unit", "y_unit") # # later on, using dataframe for (var_name in c("x", "y")) { idx <- match(var_name, attr(my_frame, "names")) var_unit <- attr(my_frame, "units")[[idx]] print (paste("max ", var_name, ": ", max(my_frame[[var_name]]), var_unit)) } ______________________________________________ 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.