[datatable-help] Replace missings by dates in data table

[Frank S.]

Hi to all members of the list, Let's say I have the following data (small example): DT <- data.table(ID=c(1,1,2),        start=c("1985-01-01","1993-07-15","1993-05-17"),        end=c("1992-05-01","1997-02-01",NA))I would want to replace missing values by "01-01-2000" in "end" variable, and convert both "start" and "end" columns in as.Date class. I tried the code: DT[ , c("start", "end"):=list(as.Date(start,format="%d/%m/%Y",origin="1900-10-01"),as.Date(ifelse(is.na(end),"01/01/2000",end),format="%d/%m/%Y",origin="1900-10-01")), by=ID] Error in `[.data.table`(DT, , `:=`(c("start", "end"), list(as.Date(start,  :   Type of RHS ('double') must match LHS ('character').  What I have to change? Am I doing it in a too complicated way? Thanks in advance for any help!!   		 	   		  
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