Re: [R] finding row and column indices of date in multiple columns of a data frame

Dear Gonçalo, If DF is your data set, something like this should do the job: which(DF==yourdate,arr.ind=TRUE) > # Example > Dates<-c('01/18/2009','01/19/2009','01/20/2009','01/21/2009') > DF<-data.frame( +Site=sample(4), + "Site#"=sample(4), + Season=sample(4), +Da

[R] finding row and column indices of date in multiple columns of a data frame

Hi, I have a data.frame SAMPLES with columns: Site Site# Season Day1 Day2 Day3 Day1, Day2, Day3 are class "Date", the other columns are numeric or factor. I have a date "mydate" that may or may not be listed in my data.frame and I need to find that out. If "mydate" is there,