ALGORITHM 1.

Type-2 mGNM multiscale Kirchhoff matrix.

Input: Γii, i = 1, 2, …, N	⊳ Diagonal terms are calculated from mFRI.
for j←2, N do	⊳ For the first row and first line of multiscale Kirchhoff matrix.
${\mathrm{\Gamma }}_{1j}=\frac{{\mathrm{\Gamma }}_{11}}{N-1}$	⊳ We equally distribute the diagonal terms into non-diagonal parts.
Γj1 = Γ1j	⊳ Use the symmetry property.
end for
for i←2, N − 1 do
sum = 0
for k←1, i − 1do
k1 = k
k2 = k + 1
sum = sum + Γk1k2	⊳ Summarize over terms already determined from previous iterations.
end for
forj←i + 1, N
${\mathrm{\Gamma }}_{ij}=\frac{{\mathrm{\Gamma }}_{ii}-sum}{N-i}$	⊳ We equally distribute the diagonal terms into non-diagonal parts.
Γji = Γij	⊳ Use the symmetry property.
end for
end for