Research Article

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

Algorithm 1

-means.
Input: : the number of clusters, : a data set containing objects.
Output: A set of clusters.
Method:
                     (1) arbitrarily choose objects from as the initial cluster centers;
                     (2) repeat
                     (3) (re)assign each object to the cluster to which the object is the most similar,
                             based on the mean value of the objects in the cluster;
                     (4) update the cluster means, that is, calculate the mean value of the objects for each cluster;
                     (5) until no change;