prtDistanceSquare  Compute distance squared
 
    DIST = prtDistanceChebychev(DS1,DS2) calculates the Distance square distance
    from all the observations in datasets DS1 to DS2, and ouputs a distance
    matrix of size DS1.nObservations x DS2.nObservations. DS1 and DS2
    should have the same number of features. DS1 and DS2 should be
    prtDataSet objects. This distance is the same as the Chebychev disance
    
    For more information, see:
    
    http://en.wikipedia.org/wiki/Chebyshev_distance
 
  Example:
 
    % Create 2 data sets
    dsx = prtDataSetStandard('Observations', [0 0; 1 1]);
    dsy = prtDataSetStandard('Observations', [1 0;2 2; 3 3]);
    % Compute distance
    distance = prtDistanceSquare(dsx,dsy)