Here you will find a sample java program to generate sparse ARFF file. The following italic text text has been taken from: http://www.cs.waikato.ac.nz... Sparse ARFF files are very similar to ARFF files, but data with value 0 are not be explicitly represented.Sparse ARFF files have the same header (i.e @relation and @attribute tags) but the data section is different. Instead of representing each value in order, like this: @data 0, X, 0, Y, "class A" 0, 0, W, 0, "class B" the non-zero ......