Hello every body, I am quite a new user of R so I beg your pardon for this naive question and the lake of syntax with wich I ask it:
I have a data frames like this: cola colb 1 c 1 i 1 i 1 c 2 i 2 c 2 c 2 i 2 i ... 10000 I would like ,for each level of cola and for x in colb: -if colb[x]=="i" and colb[x-1] does not exist (first row in dataframes), then replace colb[x] by "l" -if colb[x]=="i" and colb[x-1]=="c" (previous row in data frmes), then replace colb[x] by "l" -if colb[x]=="i" and colb[x-1]=="i" (previous row in data frmes), then replace colb[x] by "h" Thanks in advance Paul -- View this message in context: http://www.nabble.com/change-values-in-data-frames-tp18151205p18151205.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
