Add a ""GAUSS-SEIDEL PRECONDITIONER"" to ""ML"" in the following MATLAB Code: %Compute RHS and ML once for all ML = zeros(nbv,1); Fvx = zeros(nbv,1); Fvy = zeros(nbv,1); groundedratio = zeros(nbe,1); isice = false(nbe,1); for n=1:nbe %Lumped mass matrix for i=1:3 for j=1:3 % \int_E phi_i * phi_i dE = A/6 and % \int_E phi_i * phi_j dE = A/12 if(i==j) ML(index(n,j)) = ML(index(n,j))+areas(n)/6; else ML(index(n,j)) = ML(index(n,j))+areas(n)/12; end end end.

1. Add a ""GAUSS-SEIDEL PRECONDITIONER"" to ""ML"" in the following MATLAB Code:
%Compute RHS and ML once for all
ML = zeros(nbv,1);
Fvx = zeros(nbv,1);
Fvy = zeros(nbv,1);
groundedratio = zeros(nbe,1);
isice = false(nbe,1);
for n=1:nbe
%Lumped mass matrix
for i=1:3
for j=1:3
% int_E phi_i * phi_i dE = A/6 and % int_E phi_i * phi_j dE = A/12
if(i==j)
ML(index(n,j)) = ML(index(n,j))+areas(n)/6;
else
ML(index(n,j)) = ML(index(n,j))+areas(n)/12;
end
end
end