Created
January 1, 2014 12:40
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R の merge 関数は結合キーを複数指定できる ref: http://qiita.com/hereticreader/items/ac6aed5445a2198a2c49
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| merge(x=data.frame.x, y=data.frame.y | |
| , by.x=c("clm1", "clm2") | |
| , by.y=c("clm1", "clm2") | |
| ) |
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