LDL-T ALGORITHM
2016-08-23
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O FACTOR THE POSITIVE DEFINITE N BY N MATRIX A INTO LDL**T,
WHERE L IS A LOWER TRIANGULAR MATRIX WITH ONES ALONG THE DIAGONAL
AND D IS A DIAGONAL MATRIX WITH POSITIVE ENTRIES
ON THE DIAGONAL
INPUT: THE DIMENSION N; ENTRIES A(I,J), 1<=I, J<=N OF A.
OUTPUT: THE ENTRIES L(I,J), 1<=J<I, 1<=I<=N OF L AND D(I),
1<=I<=N OF D.
WHERE L IS A LOWER TRIANGULAR MATRIX WITH ONES ALONG THE DIAGONAL
AND D IS A DIAGONAL MATRIX WITH POSITIVE ENTRIES
ON THE DIAGONAL
INPUT: THE DIMENSION N; ENTRIES A(I,J), 1<=I, J<=N OF A.
OUTPUT: THE ENTRIES L(I,J), 1<=J<I, 1<=I<=N OF L AND D(I),
1<=I<=N OF D.
fortran
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