sorting data by variables in R

This question already has an answer here:

How to sort a dataframe by multiple column(s)? 16 answers

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为了提高可读性，我建议

sort.airquality <- airquality[with(airquality, order(Ozone, Wind)),]

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你要

sort.airquality <- airquality[order(airquality$Ozone, airquality$Wind),]

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