The operation computes the minimum distance of each data record in <data> to the classes defined in <cldata>. These distances are stored in the target data frame <trgdata>. It will have as many data records as the <data> includes and as many fields as there are classes in the classified data. Note that the sources <data> and <cldata> must match. Naturally, such data records, that are referred from <cldata>, will have one field that is zero.