function gX = biasKernDiagGradX(kern, X)

% BIASKERNDIAGGRADX Gradient of BIAS kernel's diagonal with respect to X.
%
%	Description:
%
%	GX = BIASKERNDIAGGRADX(KERN, X) computes the gradient of the
%	diagonal of the bias kernel matrix with respect to the elements of
%	the design matrix given in X.
%	 Returns:
%	  GX - the gradients of the diagonal with respect to each element of
%	   X. The returned matrix has the same dimensions as X.
%	 Arguments:
%	  KERN - the kernel structure for which gradients are being
%	   computed.
%	  X - the input data in the form of a design matrix.
%	
%
%	See also
%	BIASKERNPARAMINIT, KERNDIAGGRADX, BIASKERNGRADX


%	Copyright (c) 2004, 2005, 2006 Neil D. Lawrence
% 	biasKernDiagGradX.m CVS version 1.4
% 	biasKernDiagGradX.m SVN version 1
% 	last update 2011-06-16T07:23:44.000000Z


gX = zeros(size(X));