c = plus(a,b) : computes the sum of iFunc objects @iFunc/plus (+) function to compute the sum of functions when one of the argument is a character string, it is used as-is in the operator expression. When this string also contains an equal or ';' character, the argument is prepended/appended to the Expression: model = gauss + 'b' adds a Gaussian with 'b' (you then need to define 'b' somewhere else, for instance as a global variable in Constraint: model.Constraint = 'global b' model = gauss + 'disp(''This was the Gaussian !'');' adds some code after the Expression. model = 'disp(''There comes the Gaussian !'');' + gauss adds some code before the Expression. input: a: object or array (iFunc or numeric or char) b: object or array (iFunc or numeric or char) output: c: object or array (iFunc) ex: c=a+1; Version: Aug. 22, 2017 See also iFunc, iFunc/minus, iFunc/plus, iFunc/times, iFunc/rdivide