r - Creating Index based on Multiple Variables -


i looking creating indexes in r haven't found quite i'm looking index multiple variables. i'd reset when variable 1 changes well. have tried finaltablemba$index <- as.numeric(seq_along(finaltablemba$column_2)), can't seem figure out how add in second variable have index reset.

any appreciated!

for example, hoping accomplish following:

column 1     column 2    index 10/1/2013    10/1/2013     1 10/1/2013    10/2/2013     2..... 10/1/2013    10/30/2013    30 11/1/2013    11/1/2013     1 11/1/2013    11/2/2013     2

you can use by split data first column , apply tricky function each splitted group :

 dat$index <- unlist(by(dat$column2,dat$column1,function(x)       as.integer(as.factor(as.character(x)))))  column1    column2 index 1 10/1/2013  10/1/2013     1 2 10/1/2013  10/2/2013     2 3 10/1/2013 10/30/2013     3 4 11/1/2013  11/1/2013     1 5 11/1/2013  11/2/2013     2

but think better format column2 regular date , use format(x,'%d') on it. 

dat$index <- unlist(by(dat$column2,dat$column1,function(x)          as.numeric(format(as.date(x,format='%m/%d/%y'),'%d'))))

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