Feat ldlt #90
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Feat ldlt #90
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add bandwidth tests add type promotion tests
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This extends
LinearAlgebra's LDLT for the symmetric tridiagonal type to symmetric banded matrices.I think it's good to have a linear system solver written in plain Julia because currently
luandcholeskypipe directly into LAPACK andqruses some BLAS functions.There's no pivoting (there's no pivoting for
SymTridiagonaleither) but unlike Cholesky it may not fail just because the matrix is indefinite.