here is the example of index used in an EFGM code

[index] = define_support(node,pt1,di);

function [index] = define_support(node,x,di)

% find nodes in neighbouring of point x

% Inputs:

% node : numnode x 2, nodal coordinates

% x : 1 x 2, coordinate of point

% di : 1 x numnode, size of support of nodes

numnode = size(node,1);

dif = node - [ones(numnode,1)*x(1,1) ones(numnode,1)*x(1,2)]; % difference between co-ordinates of nodes and point pt in the main code

for i = 1 : numnode

r(i) = norm(dif(i,:));

end

index = find(r - di

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