Aggregate data in one column based on values in another column

I know there is an easy way to do this...but, I can't figure it out. I have a dataframe in my R script that looks something like this: A B C 1.2 4 8 2.3 4 9 2.3 6 0 1.2 3 3 3.4 2 1 1.2 5 1 Note that A, B, and C are column names. And I'm trying to get variables like this: sum1

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