7.2 data.table. data.table是data.frame資料框型別的延伸，如要使用必須安裝並載入data.table(Dowle ... ... <看更多>

data.table is widely used by the R community. It is being directly used by hundreds of CRAN and Bioconductor packages, and indirectly by thousands. It is ... ... <看更多>

for transforming data in R. It works by converting R's native data frame objects into data.tables with new and enhanced functionality. ... <看更多>

DF1<-merge(DF1, lookup[,.(id, name)], by='id', all.x=TRUE, all.y=FALSE). I think the merge command is what you are looking for here, but you were missing ... ... <看更多>