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“将 case 列拆分为两列, 并删除原列”与“tstrsplit(DT$rate, split = "/")][, rate := NULL]”中的字符，似乎没有统一符号 #5

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shenjian5 opened this issue Jun 22, 2022 · 0 comments

shenjian5 commented Jun 22, 2022

感谢张老师对R语言资料的分享。张老师的R语言书籍，总结了常用的知识点和技巧，真的是良心之作。

ps: 书本2.7节（第200页），预计是笔误了（“将 case 列拆分为两列, 并删除原列”与“tstrsplit(DT$rate, split = "/")][,
rate := NULL]”中的字符，似乎没有统一符号）。

DT = as.data.table(table3)

将 case 列拆分为两列, 并删除原列

DT[, c("cases", "population") := tstrsplit(DT$rate, split = "/")][, rate := NULL]

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