Provided by: liblapack-doc_3.3.1-1_all bug

NAME

       LAPACK-3 - the number of eigenvalues of the symmetric tridiagonal matrix T that are in the
       interval (VL,VU] if JOBT = 'T', and of L D L^T if JOBT = 'L'

SYNOPSIS

       SUBROUTINE SLARRC( JOBT, N, VL, VU, D, E, PIVMIN, EIGCNT, LCNT, RCNT, INFO )

           CHARACTER      JOBT

           INTEGER        EIGCNT, INFO, LCNT, N, RCNT

           REAL           PIVMIN, VL, VU

           REAL           D( * ), E( * )

PURPOSE

       Find the number of eigenvalues of the symmetric tridiagonal  matrix  T  that  are  in  the
       interval (VL,VU] if JOBT = 'T', and of L D L^T if JOBT = 'L'.

ARGUMENTS

        JOBT    (input) CHARACTER*1
                = 'T':  Compute Sturm count for matrix T.
                = 'L':  Compute Sturm count for matrix L D L^T.

        N       (input) INTEGER
                The order of the matrix. N > 0.

        VL      (input) DOUBLE PRECISION
                VU      (input) DOUBLE PRECISION
                The lower and upper bounds for the eigenvalues.

        D       (input) DOUBLE PRECISION array, dimension (N)
                JOBT = 'T': The N diagonal elements of the tridiagonal matrix T.
                JOBT = 'L': The N diagonal elements of the diagonal matrix D.

        E       (input) DOUBLE PRECISION array, dimension (N)
                JOBT = 'T': The N-1 offdiagonal elements of the matrix T.
                JOBT = 'L': The N-1 offdiagonal elements of the matrix L.

        PIVMIN  (input) REAL
                The minimum pivot in the Sturm sequence for T.

        EIGCNT  (output) INTEGER
                The number of eigenvalues of the symmetric tridiagonal matrix T
                that are in the interval (VL,VU]

        LCNT    (output) INTEGER
                RCNT    (output) INTEGER
                The left and right negcounts of the interval.

        INFO    (output) INTEGER

FURTHER DETAILS

        Based on contributions by
           Beresford Parlett, University of California, Berkeley, USA
           Jim Demmel, University of California, Berkeley, USA
           Inderjit Dhillon, University of Texas, Austin, USA
           Osni Marques, LBNL/NERSC, USA
           Christof Voemel, University of California, Berkeley, USA

 LAPACK auxiliary routine (version 3.2.2)   April 2011                            SLARRC(3lapack)