atan atan(angle: Number): Number Returns an arc tangent value that can range from -pi/2 through pi/2. Introduced in DataWeave version 2.4.0. Parameters Name Description angle Number to convert into its arc tangent value. Example This example shows how atan behaves with different inputs. Source %dw 2.0 import * from dw::util::Math output application/json --- { "atan0": atan(0), "atan13": atan(0.13), "atan-1": atan(-1) } Output { "atan0": 0.0, "atan13": 0.12927500404814307, "atan-1": -0.7853981633974483 }