larrd: step in stemr, tridiag eig

Functions
subroutine	dlarrd (range, order, n, vl, vu, il, iu, gers, reltol, d, e, e2, pivmin, nsplit, isplit, m, w, werr, wl, wu, iblock, indexw, work, iwork, info)
	DLARRD computes the eigenvalues of a symmetric tridiagonal matrix to suitable accuracy.
subroutine	slarrd (range, order, n, vl, vu, il, iu, gers, reltol, d, e, e2, pivmin, nsplit, isplit, m, w, werr, wl, wu, iblock, indexw, work, iwork, info)
	SLARRD computes the eigenvalues of a symmetric tridiagonal matrix to suitable accuracy.

Detailed Description