d2r.m

％ A 2D homogeneous convection-diffusion case (u=exp(-ex*deta*x-ex*deta*y) with a square with ％ all

% 2D Euclidean distance function for RBF

function D2r=D2r(xr,xs,yr,ys)

D2r=sqrt((xr-xs)^2+(yr-ys)^2);