Hi, You could try: df3 <- df1 library(plyr) df3[,-1] <- ddply(df1,.(Nom1=gsub("\\d+","",Nom)),colwise(function(x) rep(max(x),length(x))))[,-1] attr(df3,"row.names") <- attr(df2,"row.names") identical(df2,df3) #[1] TRUE
A.K. On Wednesday, January 1, 2014 11:56 AM, Arnaud Michel <michel.arn...@cirad.fr> wrote: Dear All, >From the dataframe df1 df1 <- structure(list(Nom = structure(1:9, .Label = c("A1", "A2", "A3", "B1", "B2", "C1", "C2", "C3", "C4"), class = "factor"), Pays1 = c(1, 1, 0, 0, 1, 0, 0, 0, 0), Pays2 = c(0, 0, 0, 1, 1, 0, 1, 0, 1), Pays3 = c(0, 0, 0, 0, 1, 0, 0, 0, 0), Pays4 = c(1, 0, 0, 0, 0, 0, 1, 0, 1), Pays5 = c(1, 1, 0, 0, 0, 0, 0, 0, 0)), .Names = c("Nom", "Pays1", "Pays2", "Pays3", "Pays4", "Pays5"), row.names = c(1L, 3L, 4L, 2L, 5L, 6L, 7L, 8L, 9L), class = "data.frame") I look for a way to build the new dataframe df2 df2 <- structure(list(Nom = structure(1:9, .Label = c("A1", "A2", "A3", "B1", "B2", "C1", "C2", "C3", "C4"), class = "factor"), Pays1 = c(1, 1, 1, 1, 1, 0, 0, 0, 0), Pays2 = c(0, 0, 0, 1, 1, 1, 1, 1, 1), Pays3 = c(0, 0, 0, 1, 1, 0, 0, 0, 0), Pays4 = c(1, 1, 1, 0, 0, 1, 1, 1, 1), Pays5 = c(1, 1, 1, 0, 0, 0, 0, 0, 0)), .Names = c("Nom", "Pays1", "Pays2", "Pays3", "Pays4", "Pays5"), row.names = c(NA, -9L), class = "data.frame") The purpose is to transform df1 it df2 by giving for every group of lines A, B and C the value 1 if there is at least a value equal to 1 or a value 0 if there is no value equal to 1 Thanks for your helps -- Michel ARNAUD Chargé de mission auprès du DRH DGDRD-Drh - TA 174/04 Av Agropolis 34398 Montpellier cedex 5 tel : 04.67.61.75.38 fax : 04.67.61.57.87 port: 06.47.43.55.31 ______________________________________________ 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. ______________________________________________ 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.