prtKernelSet  A set of prtKernel Object
 
    KC = prtKernelSet(KERNOBJ) creates a prtKernelSet object consisting
    of one prtKenrel KERNOBJ.
 
    KC = KERNOBJ1 & KERNOBJ2 creates a prtKernelSet object consisting of
    the prtKernel objects KERNOBJ1, and KERNOBJ2. Additional prtKernel
    object can be included by appending more objects using the AND(&)
    operator.
 
    When the TRAIN method is called on a prtKernetSet object, the
    train method of all member prtKernel objects is invoked. 
 
    When the RUN method is called on a prtKernelSet object is called,
    the RUN method of all member prtKernel objects is invoked, and the
    output is the concatenation of the results.
 
    % Example:
 
    ds = prtDataGenBimodal;       % Generate a dataset
    k1 = prtKernelRbf;            % Create a prtKernel object with 
                                  % default value of sigma 
    k2 = prtKernelRbf('sigma',2); % Create a prtKernel object with
                                  % specified value of sigma
        
    kSet = k1&k2;                 % Create a prtKernel object using the
                                  % AND operator 
    kSet =  kSet.train(ds);       % Train
       
    g = kSet.run(ds);             % Evaluate
  
    imagesc(g.getObservations);   %Plot the results