
% GIBBSKERNDIAGGRADIENT Compute the gradient of the GIBBS kernel's diagonal wrt parameters.
%
%	Description:
%
%	G = GIBBSKERNDIAGGRADIENT(KERN, X, FACTORS) computes the gradient of
%	functions of the diagonal of the Mark Gibbs's non-stationary kernel
%	matrix with respect to the parameters of the kernel. The parameters'
%	gradients are returned in the order given by the
%	gibbsKernExtractParam command.
%	 Returns:
%	  G - gradients of the relevant function with respect to each of the
%	   parameters. Ordering should match the ordering given in
%	   gibbsKernExtractParam.
%	 Arguments:
%	  KERN - the kernel structure for which the gradients are computed.
%	  X - the input data for which the gradient is being computed.
%	  FACTORS - partial derivatives of the function of interest with
%	   respect to the diagonal elements of the kernel.
%	
%
%	See also
%	GIBBSKERNPARAMINIT, KERNDIAGGRADIENT, GIBBSKERNEXTRACTPARAM, GIBBSKERNGRADIENT


%	Copyright (c) 2006 Neil D. Lawrence
% 	gibbsKernDiagGradient.m CVS version 1.1
% 	gibbsKernDiagGradient.m SVN version 1
% 	last update 2011-06-16T07:23:44.000000Z

g = zeros(1, kern.nParams);
g(end) = sum(covDiag);
