Hi everybody, could anyone help me in finding a way for selecting from a dataframe each row that comes before another that matches a condition?
EXAMPLE: df raw.number name date temp 1 aaa 2001-04-15 15 2 aaa 2001-01-15 12 3 aaa 2001-03-15 13 ... i-1 bbb 2002-04-15 15 i bbb 2002-03-15 14 the condition is: df$temp==15 matching raws are 1 and i-1: I need something to select (only) rows where date=one month before the matching raws, so raws 3 and i. (the variable name has more than one level) Thanks ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
