?? 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.%%@article{Scholkopf1998,% author = {Bernhard Scholkopf and Alex J. Smola and Klaus-Robert% M{\" u}ller},% title = {Nonlinear Component Analysis as a Kernel Eigenvalue Problem},% journal = {Neural Computation},% year = {1998},% volume = {10},% number = {5},% pages = {1299-1319}%}% Copyright: D.M.J. Tax, D.M.J.Tax@prtools.org% Faculty EWI, Delft University of Technology% P.O. Box 5031, 2600 GA Delft, The Netherlandsn = size(Ktrn,1);I = repmat(1/n,n,n);m = size(Ktst,1);I1 = repmat(1/n,m,n);K = Ktst - I1*Ktrn - Ktst*I + I1*Ktrn*I;return
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