Elbow method findig number of clusters for 90 different kmeans(weka) : I am doing incremental learning and i have to do clustering for every iteration. And i am doing 90 different clustering with simple kmeans on weka in java. How can find number of clusters for every clustering process? I can find wss easily so i thought elbow method can be solve this problem but i could not implement that. I am doing this in java code with weka library. 