On Mon, May 30, 2005 at 09:15:32AM +0000, zhihua li wrote : > hi netters > > I have a rather simple question. I have a data frame with two variables X > and Y, both of which are factors. X has 100 levels while Y has 10 levels > only. The data frame has 100 rows in all, so for X the values are unique, > and Y has many replicate values. Now I wanna reduce the data frame into 10 > rows only, according to the 10 levels of Y. I don't care which value of X > is in the same row with Y in the final data frame, as long as it is in > agreement with the original data frame.
Dear list, I am a new subscriber, using R to analyse genomics data. I have a similar question, maybe even identical, but I am not sure... >From a data frame with two factors and one value, I would like to obtain a data frame with one factor and one value per level in the removed factor. For instance: F1 F2 V ----------------- A X 3 A Y 6 B X 5 C X 9 C Y 3 Would become: F1 VX VY ------------------ A 3 6 B 5 0 C 9 3 I am sure I have seen a tool to do this some time ago, but I do not remember its name. Can somebody help me ? Best regards, -- Charles Plessy, Ph.D. - Genome Science Laboratory The Institute for Physical and Chemical Research (RIKEN) 2-1 Hirosawa, Wako, Saitama 351-0198, Japan [EMAIL PROTECTED] -- Fax: 048-462-4686 -- Tel: 048-467-9515 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
