Research Article

Estimating the Concrete Compressive Strength Using Hard Clustering and Fuzzy Clustering Based Regression Techniques

Algorithm 2

Fuzzy -Means (FCM) Clustering.
Method:
(1) Fix , , , . Choose an initial matrix . Then at Step  , , = 0, 1, …, LMAX.
(2) Computer means , with the following equation:
           ; 
(3) Compute an updated membership matrix
with the following equation:
           ; ;  
(4) Compare to in any convenient matrix norm. If   <  , stop. Otherwise set
= and return to .