How do I add duplicate rows to a data frame in R? -


i have edge list in r looks this:

from    start      end      b    1/1/2011   1/2/2011     f    1/1/2011   1/1/2011 b     g    1/2/2011   1/2/2011  c        1/2/2011   1/6/2011 d     c    1/2/2011   1/3/2011

what create new edge list in r looks this

from    time     b    1/1/2011     b    1/2/2011     f    1/1/2011 b     g    1/2/2011 c        1/2/2011 c        1/3/2011 c        1/4/2011 c        1/5/2011 c        1/6/2011 d     c    1/2/2011 d     c    1/3/2011

in other words, duplicate first 2 columns each row in first table each day between start , end date, inclusive. way this? help!

the date class has seq function (seq.date) can use, or can use idate data.table:

df = read.table(text = 'from    start      end      b    1/1/2011   1/2/2011     f    1/1/2011   1/1/2011 b     g    1/2/2011   1/2/2011  c        1/2/2011   1/6/2011 d     c    1/2/2011   1/3/2011', header = t)  library(data.table) dt = data.table(df)  dt[, cbind(.sd, seq(as.date(start, '%m/%d/%y'),                 as.date(end, '%m/%d/%y'), 1)), = list(start,end)]  # or dt[, cbind(.sd, seq(as.idate(start, '%m/%d/%y'),                     as.idate(end, '%m/%d/%y'), 1)), = list(start,end)] #       start      end         v2 # 1: 1/1/2011 1/2/2011     b 2011-01-01 # 2: 1/1/2011 1/2/2011     b 2011-01-02 # 3: 1/1/2011 1/1/2011     f 2011-01-01 # 4: 1/2/2011 1/2/2011    b  g 2011-01-02 # 5: 1/2/2011 1/6/2011    c  2011-01-02 # 6: 1/2/2011 1/6/2011    c  2011-01-03 # 7: 1/2/2011 1/6/2011    c  2011-01-04 # 8: 1/2/2011 1/6/2011    c  2011-01-05 # 9: 1/2/2011 1/6/2011    c  2011-01-06 #10: 1/2/2011 1/3/2011    d  c 2011-01-02 #11: 1/2/2011 1/3/2011    d  c 2011-01-03

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