Dear all, I would be grateful if someone can help me to create a program for cluster analysis. I know the CLUST_WTS function but I don't understand what is the format of the input file. I have 1500 files, each containing 3 columns and 145 rows. The first one is a number from 0 to 144 (that represents the hour), the second one is the latitude and the third is the longitude. Then, I would like to calculate a number 'n' of clusters with the representative paths (latitude and longitude evolution during this 144 hours). Could anyone help me to form the input file for the function CLUST_WTS? Thanks in advance, Mar