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Migration to the new API can be achieved with this rsc.io/rf script: ``` rf ex { import "gonum.org/v1/gonum/spatial/r2"; var p,q r2.Vec; var f float64; p.Add(q) -> r2.Add(p, q); p.Sub(q) -> r2.Sub(p, q); p.Scale(f) -> r2.Scale(f, p); p.Dot(q) -> r2.Dot(p, q); p.Cross(q) -> r2.Cross(p, q); p.Rotate(f, q) -> r2.Rotate(p, f, q); } ``` Updates gonum/gonum#1553.