Extend a ranking method of trapezoidal fuzzy numbers to all fuzzy numbers by weighting functions

Recently Abbasbandy and Hajjari (Computers and Mathematics with Applications 57 (2009) 413-419) have introduced a ranking method for the trapezoidal fuzzy numbers. This paper extends theirs method to all fuzzy numbers, which uses from a defuzzification of fuzzy numbers and a general weighting function. Extended method is interesting for ranking all fuzzy numbers, and it can be applied for solving and optimizing engineering and economics problems in a fuzzy environment.