%GETSIZE Dataset size and number of classes
%
% [M,K,C] = GETSIZE(A,DIM)
%
% INPUT
% A Datafile
% DIM 1,2 or 3 : the number of the output argument to be returned
%
% OUTPUT
% M Number of objects
% K Number of features
% C Number of classes
%
% DESCRIPTION
% Returns size of the datafile A and the number of classes. C is determined
% from the number of labels stored in A.LABLIST. If DIM = 1,2 or 3, just
% one of these numbers is returned, e.g. C = GETSIZE(A,3).
% The feature size K is determined by reading and processing the first
% object of A.