prtDataGenUnimodal   Generates unimodal example data
 
    DATASET = prtDataGenUnimodal returns a prtDataSetClass with randomly
    generated data according to the following distribution.
 
        H0: N([-1 -1],eye(2))
        H1: N([2 2],[1 .5; .5 1])
 
    % Example
 
    ds = prtDataGenUniModal;
    plot(ds)