singular_leading_submatrix(A, U, k)
Symmetric matrix that is not positive definite.
Upper triangular matrix resulting of an incomplete Cholesky decomposition of matrix A
.
Positive integer such that the leading k by k submatrix from A is the first non-positive definite leading submatrix.
Amount that should be added to the element (k, k) of the leading k by k submatrix of A
to make it singular.
A vector such that v.T B v = 0
. Where B is the matrix A after delta
is added to its element (k, k).
Compute term that makes the leading k
by k
submatrix from A
singular.
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