center.m

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function K = center(Ktst,Ktrn)
%CENTER Center the kernel matrix
%
%   K = center(Ktst,Ktrn)
%
% Center the kernel matrix Ktst in the kernelspace defined by Ktrn.

% Copyright: D. Tax, R.P.W. Duin, [e-mail]
% Faculty of Applied Physics, Delft University of Technology
% P.O. Box 5046, 2600 GA Delft, The Netherlands

n = size(Ktrn,1);
I = ones(n,n)/n;
m = size(Ktst,1);
I1 = ones(m,n)/n;

K = Ktst - I1*Ktrn - Ktst*I + I1*Ktrn*I;

return