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並前往https://stackguides.com/questions/47541581/using-grep-to-substitute-values-from-one-data-frame-to-another-in-r

Using grep to substitute values from one data frame to another ...

This may not be the most efficient way, but it will do the job. df1$Real.car = NA df1$years = NA for (i in 1:nrow(df2)) { match.line ...

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