www.gusucode.com > mbcmodels 工具箱 matlab 源码程序 > mbcmodels/@xregrbf/wendland.m
function y = wendland( r, m ) %XREGRBF/WENDLAND Wendland's compactly supported RBF kernel % WENDLAND(R,M) is a matrix the same size as R containing the values of the % Wendland RBF kernel for the for model M at the squared and weighted % distances given in R. % % Wendland's compactly supported kernels are given in 'Radial Basis Functions % with Compactly Support (sic.) and Multizone Decomposition: Applications to % environmental modelling', S. M. Wong, Y.C. Hon, and T.S. Li. % Copyright 2000-2004 The MathWorks, Inc. and Ford Global Technologies, Inc. % Rewritten 12/2/2001 to use the general formulae given in 'Radial Basis % Functions with Compactly Support (sic.) and Multizone Decomposition: % Applications to environmental modelling', S. M. Wong, Y.C. Hon, and T.S. Li, % and to include continuity = 6, and remove the restriction on the space % dimension. [exponent, polycoeff] = wendcoeff( m ); y = zeros( size( r ) ); ind = find( r < 1 ); r = sqrt( r(ind) ); r = r(:); if ~isempty( r ), y(ind) = (1-r).^(exponent) .* polyval_mex( polycoeff, r ); end %------------------------------------------------------------------------------| % EOF %------------------------------------------------------------------------------|