找不到對象“Month”
airquality$Month <- factor(airquality$Month)
> xyplot(Temp~Ozone|Month,date=airquality,
+ ? ? ? ?layout=c(5,1))
Error in eval(modelRHS.vars[[i]], data, env) : 找不到對象'Month'
qq_吉祥如意_10
2019-03-29
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2019-06-06
輸錯了，data = airquality不是date