riccati_kernel_functions.m

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function k = riccati_kernel_function(model, type)
%function k = riccati_kernel_function(model, detailed_data)
%  Return the kernel for the interpolation between the gamma values
%  TODO: Maybe move to a class in RB matlab...
%
% Andreas Schmidt, 2015

switch type
    case 'multiquadratic'
        k = @(x,y) sqrt(1 + norm(x-y)^2);
    case 'gauss'
        k = @(x,y) exp( -norm(x-y)^2/5000 );
    case 'thinplate'
        k = @(x,y) norm(x-y)^2*log(norm(x-y)+eps);
    otherwise
        error(['Kernel function type ', type, ...
            ' is not known']);
end

end