Hi, ----- Original Message ----- From: "Ajay Shah" <[EMAIL PROTECTED]> > > But this doesn't work since if D is a data frame, you can't say > D[d]. Let me show you: > > > x = runif(100) > > y = runif(100) > > D = data.frame(x, y) > > d = c(7,3,2) > > E = D[d] > Error in "[.data.frame"(D, d) : undefined columns selected > > Any suggestions on how one can do such pretty things as D[d] where D > is a data frame?
So I take it you want to select the 7th, 3rd, and 2nd observation (i.e. rows) from D? A data frame has two dimensions, so you need to specify the row and columns. Maybe try: E = D[d,] HTH, Kevin Wang ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
