code: public SDVariable erf(String name, SDVariable x) {
          validateNumerical("erf (error function)", x);
          SDVariable ret = f().erf(x);
          return updateVariableNameAndReference(ret, name);
      }
docs: Element-wise Gaussian error function - out = erf(in)
  
  @param name Output variable name
  @param x    Input variable
  @return Output variable