R subset

subset

subset(x, subset, select, drop = FALSE, ...)

select 显示指定列

selectresult=subset(df1,name=="aa" & sex=="f",select=c(age,sex))

负号排除指定列

selectresult=subset(df1,name=="aa" & sex=="f",select=c(-age,-sex))

挑选省份为安徽、江苏和北京的行： %in%

type = c("NASA", "Tao Xue","ZUIXIN")
mydata[USERDATA1 %in% type,]
mydata = subset(data, TYPE %in% c("NASA", "Tao Xue","ZUIXIN"))