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I want to unite three rows in a column. I can do that however I will use the column as an x axis for the graph but after I united the rows the column becomes a character and when I tried to use as.numeric() it gives me an error. How can I create the new column with three rows as a numeric vector?
Day Month Year Date
1 1 2000 1.02.2000
2 2 2000 2.02.2000
3 3 2000 3.03.2000
Like that. Thanks.
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