TY Uwe, So I will have to write a line for each condition? Right?
In fact I was trying to do something with apply in one line, but couldn't achieve any result. In fact, all my transformation will be multiplying one object by a specific number according to the value of df$x. Arnaud Gaboury A2CT2 Ltd. -----Original Message----- From: Uwe Ligges [mailto:lig...@statistik.tu-dortmund.de] Sent: vendredi 24 février 2012 16:33 To: Arnaud Gaboury Cc: r-help@r-project.org Subject: Re: [R] data frame manipulation with condition On 24.02.2012 16:25, Arnaud Gaboury wrote: > Dear list, > > n00b question, but still can't find any easy answer. > > Here is a df: Change >> df<-data.frame(cbind(x=c("AA","BB","CC","AA"),y=1:4)) to df <- data.frame(x = c("AA","BB","CC","AA"), y = 1:4) to make your object a sensible data.frame. >> df > x y > 1 AA 1 > 2 BB 2 > 3 CC 3 > 4 AA 4 > > > I want to modify this df this way : > if df$x=="AA" then df$y=df$y*10 df$y[df$x=="AA"] <- df$y[df$x=="AA"] * 25 ... Uwe Ligges > if df$x=="BB" then df$y=df$y*25 > and so on with other conditions. > > TY for any help. > > Trading > > A2CT2 Ltd. > > > Arnaud Gaboury > > A2CT2 Ltd. > > ______________________________________________ > 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.
