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Use numeric value of `colnames` to recalculate columns in a data.frame using `dplyr`'s `mutate_a
| Author | Votes | Δ |
|---|---|---|
| zx8754 | 4 | +2.41 |
| akrun | 3 | -0.51 |
| Ronak Shah | 3 | -0.90 |
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