how to calculate interference?

n = 3; ri=0.9

source = 1;

destination = 3;

Link=(n*(n-1))/2;

c=2^Link;

NN = toeplitz(Link+1:-1:2)

mask = logical(fliplr(diag(ones(1,Link-1),-1)));

NN(mask) = 1;

for c = 0:2^Link-1

l = bitget(c, NN)

end

Edges = Link

for c = 0:2^Link-1

l = bitget(c, NN)

G = graph(l~=0)

G.Edges

path = shortestpath(G,source,destination)

end

D = zeros(3,3);

for r = 1:3

for s = 1:3

if r~=s

D(r,s) = sqrt(r.^2+s.^2);

end

end

end

how to calculate interference.

ri^m is the formula

m is the interfering node