Dear Bert, Another option is to replicate SDF2 so the number of rows matches with those of SDF1.
SDF1 <- data.frame(matrix(rnorm(144 * 2), nrow = 144)) SDF2 <- data.frame(matrix(rnorm(12 * 2), nrow = 12)) SDF1 / SDF2 #yields the error SDF2a <- do.call(rbind, rep(list(SDF2), nrow(SDF1) / nrow(SDF2))) SDF1 / SDF2a #this works HTH, Thierry ---------------------------------------------------------------------------- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 [EMAIL PROTECTED] www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Bert Jacobs Verzonden: woensdag 14 mei 2008 15:43 Aan: 'Henrique Dallazuanna' CC: r-help@r-project.org Onderwerp: Re: [R] Dividing Two Dataframes Hi Henrique, I think I understand your formula, but your final result is a 12x160 data.frame, while it should be a 144x160 data.frame divide rows 1:12 with SDF2 (=12 rows) divide rows 13:24 with SDF2 (=12 rows) divide rows 25:36 with SDF2 (=12 rows) ... divide rows 133:144 with SDF2 (=12 rows) Is it easy to adapt your formula to get this result? Thx, Bert _____ From: Henrique Dallazuanna [mailto:[EMAIL PROTECTED] Sent: 14 May 2008 13:34 To: Bert Jacobs Cc: r-help@r-project.org Subject: Re: [R] Dividing Two Dataframes Try this: DFS <- lapply(split(seq(1, 144, by = 1), rep(1:12, each = 12)), function(x)SDF1[x,]/SDF2) On Wed, May 14, 2008 at 5:02 AM, Bert Jacobs <[EMAIL PROTECTED]> wrote: Hi, I have two dataframes one with 144 rows and 160 columns (SDF1) and one with 12 rows and 160 columns (SDF2). Now I'm trying to divide rows 1:12 with SDF2, rows 13:24 with SDF2, rows 25:36 with SDF 2, . In S-Plus the following code works fine: DFS = SDF1[1:144,1:60] / as.vector(SDF2[1:12,1:160]) but in R when I try to implement the formula I get the following error: "/ only defined for equally-sized data frames" Can someone help me out on this one. Thx in advance. Bert [[alternative HTML version deleted]] ______________________________________________ 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. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]] ______________________________________________ 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.
