[英]Convert string month to numeric in R
另一種方法是將列轉換為因子:
Month <- factor(Month, levels=month.name)
Month
# [1] September October November December January February March April May June July August
# Levels: January February March April May June July August September October November December
as.numeric(Month)
# [1] 9 10 11 12 1 2 3 4 5 6 7 8
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