Thank you, Gabor. This does the job. Y
________________________________ From: Gabor Grothendieck <ggrothendi...@gmail.com> Cc: r-sig-gui@stat.math.ethz.ch Sent: Friday, January 30, 2009 8:32:31 AM Subject: Re: [R-gui] Lengthening a data frame by repeating it In the post x and y are matrices, not data frames. Converting them to data frames, try: > x.df <- as.data.frame(x); y.df <- as.data.frame(y) > data.frame(x.df[1], x.df[2], y.df) V1 V2 V1.1 V2.1 1 1 3 11 21 2 2 4 12 22 3 1 3 13 23 4 2 4 14 24 5 1 3 15 25 6 2 4 16 26 On Fri, Jan 30, 2009 at 8:21 AM, Yannis Tzamouranis > Hello, > > this initially seemed to me like a pretty simple thing to do with rbind/cbind > but did not manage to do it without looping. > > I have a simple data frame such as x: > x<-cbind(c(1,2),c(3,4)) >> x > [,1] [,2] > [1,] 1 3 > [2,] 2 4 > > And a longer data frame, such as y: >> y<-cbind(c(11,12,13,14,15,16),c(21,22,23,24,25,26)) >> y > [,1] [,2] > [1,] 11 21 > [2,] 12 22 > [3,] 13 23 > [4,] 14 24 > [5,] 15 25 > [6,] 16 26 > > I would like to merge them like this: > [,1] [,2] [,3] [,4] > [1,] 1 3 11 21 > [2,] 2 4 12 22 > [3,] 1 3 13 23 > [4,] 2 4 14 24 > [5,] 1 3 15 25 > [6,] 2 4 16 26 > > (ie by repeating the short frame as many times as necessary (a known number) > and inserting it before the y columns. > The need to not loop comes from the large number of times it would have to be > repeated(thousands) before merged with another table of the longer, new > length. > > Any ideas? > > Thank you, > Yannis Tzamouranis > > I tried lengthening x (as then merging them would be easy through cbind) but > could not do it without looping. I wonder if there would be another way to > go about this... > > [[alternative HTML version deleted]] > > > _______________________________________________ > R-SIG-GUI mailing list > R-SIG-GUI@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-gui > > [[alternative HTML version deleted]]
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