R語言數據的查詢篩選-subset()

subset(x, subset, select, drop = FALSE, ...)blog &多條件查詢io  select 顯示指定列class selectresult=subset(df1,name=="aa" & sex=="f",select=c(age,sex))select 負號排除指定列im selectresult=subset(df1,name=="aa" & sex==

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