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並前往https://s3.amazonaws.com/assets.datacamp.com/blog_assets/datatable_Cheat_Sheet_R.pdf

Cheat sheet DataTable R.indd

Print column V2 and plot V3 plot(V3),. NULL)]. Doing j by Group. > DT[,.(V4.Sum=sum(V4)),by=V1] Calculate sum of V4 for every group in V1. V1 V4.Sum.

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