r - Finding the third Friday of a month and data table -

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i want find third friday of month delivery date of futures, used solution here, getnthdayofweek rcppbdt package:

library(data.table) library(rcppbdt)  data <- setdt(data.frame(mon=c(5:12, 1:12, 1:12, 1:4),               year=c(rep(2011,8), rep(2012,12), rep(2013,12), rep(2014,4)))) data[, third.friday:= getnthdayofweek(third, fri, mon, year)]

however message: error: expecting single value. missing?

since did not specify by clause in transformation, := (presumably) trying apply getnthdayofweek vectorized function.

this should work: 

data[   ,third.friday := getnthdayofweek(third, fri, mon, year)   ,by = "mon,year"] data #   mon year third.friday #1:   5 2011   2011-05-20 #2:   6 2011   2011-06-17 #3:   7 2011   2011-07-15 #4:   8 2011   2011-08-19 #5:   9 2011   2011-09-16 #6:  10 2011   2011-10-21 #7:  11 2011   2011-11-18 #8:  12 2011   2011-12-16 #9:   1 2012   2012-01-20

or, more generally, in case have duplicate mon,year tuples in object: 

data[,idx := 1:.n][   ,third.friday := getnthdayofweek(third, fri, mon, year)   ,by = "mon,year,idx" ][,idx := null][] #   mon year third.friday #1:   5 2011   2011-05-20 #2:   6 2011   2011-06-17 #3:   7 2011   2011-07-15 #4:   8 2011   2011-08-19 #5:   9 2011   2011-09-16 #6:  10 2011   2011-10-21 #7:  11 2011   2011-11-18 #8:  12 2011   2011-12-16 #9:   1 2012   2012-01-20

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