b = atan(s) : computes the arc tangent of iData object @iData/atan function to compute the inverse tangent of data sets (in radians). input: s: object or array (iData) output: b: object or array (iData) ex: b=atan(a); Version: Aug. 22, 2017 See also iData, iData/cos, iData/acos, iData/sin, iData/asin, iData/tan, iData/atan