get_sturm_count_ldl()

int stan::math::opencl_kernels::get_sturm_count_ldl	(	const __global double_d *	l,
		const __global double_d *	d,
		const double_d	shift,
		const int	n
	)

Calculates Sturm count of a LDL decomposition of a tridiagonal matrix - number of eigenvalues larger or equal to shift.

Uses stqds - calculation of shifted LDL decomposition algorithm and counts number of positive elements in D.

Parameters

l	Subdiagonal of L.
d	Diagonal of D.
shift	Shift.
n	Length of L.

Returns

Sturm count.

Definition at line 86 of file mrrr.hpp.