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n = 30;
mat = PetscMat();
mat.SetType('seqaij');
mat.SetSizes(n,n,n,n);
mat.SetUp();
for i.html">i=1:n
mat.SetValues(i.html">i,i.html">i,2.0);
end
for i.html">i=1:n-1
mat.SetValues(i.html">i+1,i.html">i,-1.0);