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Dulani/Fill Down

Created January 27, 2015 16:29
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Excel style "fill down" in R using data.table
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Fill Down
#An Excel style "fill down" for Data Table. (.SD is the Subset of Data for each 'by' group)
dataTable[,setId:=.SD[1,setId],by=setNum] #TAG:USEFUL (Excel style fill down)
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