TESTING/EIG/dstect.f(3)    Library Functions Manual    TESTING/EIG/dstect.f(3)

NAME
       TESTING/EIG/dstect.f

SYNOPSIS
   Functions/Subroutines
       subroutine dstect (n, a, b, shift, num)
           DSTECT

Function/Subroutine Documentation
   subroutine dstect (integer n, double precision, dimension( * ) a, double
       precision, dimension( * ) b, double precision shift, integer num)
       DSTECT

       Purpose:


           !>
           !>    DSTECT counts the number NUM of eigenvalues of a tridiagonal
           !>    matrix T which are less than or equal to SHIFT. T has
           !>    diagonal entries A(1), ... , A(N), and offdiagonal entries
           !>    B(1), ..., B(N-1).
           !>    See W. Kahan , Report CS41, Computer Science Dept., Stanford
           !>    University, July 21, 1966
           !>

       Parameters
           N

           !>          N is INTEGER
           !>          The dimension of the tridiagonal matrix T.
           !>

           A

           !>          A is DOUBLE PRECISION array, dimension (N)
           !>          The diagonal entries of the tridiagonal matrix T.
           !>

           B

           !>          B is DOUBLE PRECISION array, dimension (N-1)
           !>          The offdiagonal entries of the tridiagonal matrix T.
           !>

           SHIFT

           !>          SHIFT is DOUBLE PRECISION
           !>          The shift, used as described under Purpose.
           !>

           NUM

           !>          NUM is INTEGER
           !>          The number of eigenvalues of T less than or equal
           !>          to SHIFT.
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 81 of file dstect.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0         TESTING/EIG/dstect.f(3)