In an ART2Net,processes of patter n-matching and vigilance-testing must be based on the value of similari-ty of two patterns.The measurement of similarity in classical ART2is something abo ut the phases of pattern vectors.It doesn't work well when must take the magni tude of a pattern into consider,or when process a great of samples which distri bute as clustering groups.Based on this,the authors propose a new modified ART 2version:MART2.In the new one,the magnitude of an input patter is extracte d before t...