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