lasd4: D&C step: secular equation nonlinear solver

Collaboration diagram for lasd4: D&C step: secular equation nonlinear solver:

Functions
subroutine	dlasd4 (n, i, d, z, delta, rho, sigma, work, info)
	DLASD4 computes the square root of the i-th updated eigenvalue of a positive symmetric rank-one modification to a positive diagonal matrix. Used by dbdsdc.
subroutine	slasd4 (n, i, d, z, delta, rho, sigma, work, info)
	SLASD4 computes the square root of the i-th updated eigenvalue of a positive symmetric rank-one modification to a positive diagonal matrix. Used by sbdsdc.

Detailed Description