SRC/zhbev.f(3)             Library Functions Manual             SRC/zhbev.f(3)

NAME
       SRC/zhbev.f

SYNOPSIS
   Functions/Subroutines
       subroutine zhbev (jobz, uplo, n, kd, ab, ldab, w, z, ldz, work, rwork,
           info)
            ZHBEV computes the eigenvalues and, optionally, the left and/or
           right eigenvectors for OTHER matrices

Function/Subroutine Documentation
   subroutine zhbev (character jobz, character uplo, integer n, integer kd,
       complex*16, dimension( ldab, * ) ab, integer ldab, double precision,
       dimension( * ) w, complex*16, dimension( ldz, * ) z, integer ldz,
       complex*16, dimension( * ) work, double precision, dimension( * )
       rwork, integer info)
        ZHBEV computes the eigenvalues and, optionally, the left and/or right
       eigenvectors for OTHER matrices

       Purpose:


           !>
           !> ZHBEV computes all the eigenvalues and, optionally, eigenvectors of
           !> a complex Hermitian band matrix A.
           !>

       Parameters
           JOBZ

           !>          JOBZ is CHARACTER*1
           !>          = 'N':  Compute eigenvalues only;
           !>          = 'V':  Compute eigenvalues and eigenvectors.
           !>

           UPLO

           !>          UPLO is CHARACTER*1
           !>          = 'U':  Upper triangle of A is stored;
           !>          = 'L':  Lower triangle of A is stored.
           !>

           N

           !>          N is INTEGER
           !>          The order of the matrix A.  N >= 0.
           !>

           KD

           !>          KD is INTEGER
           !>          The number of superdiagonals of the matrix A if UPLO = 'U',
           !>          or the number of subdiagonals if UPLO = 'L'.  KD >= 0.
           !>

           AB

           !>          AB is COMPLEX*16 array, dimension (LDAB, N)
           !>          On entry, the upper or lower triangle of the Hermitian band
           !>          matrix A, stored in the first KD+1 rows of the array.  The
           !>          j-th column of A is stored in the j-th column of the array AB
           !>          as follows:
           !>          if UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j;
           !>          if UPLO = 'L', AB(1+i-j,j)    = A(i,j) for j<=i<=min(n,j+kd).
           !>
           !>          On exit, AB is overwritten by values generated during the
           !>          reduction to tridiagonal form.  If UPLO = 'U', the first
           !>          superdiagonal and the diagonal of the tridiagonal matrix T
           !>          are returned in rows KD and KD+1 of AB, and if UPLO = 'L',
           !>          the diagonal and first subdiagonal of T are returned in the
           !>          first two rows of AB.
           !>

           LDAB

           !>          LDAB is INTEGER
           !>          The leading dimension of the array AB.  LDAB >= KD + 1.
           !>

           W

           !>          W is DOUBLE PRECISION array, dimension (N)
           !>          If INFO = 0, the eigenvalues in ascending order.
           !>

           Z

           !>          Z is COMPLEX*16 array, dimension (LDZ, N)
           !>          If JOBZ = 'V', then if INFO = 0, Z contains the orthonormal
           !>          eigenvectors of the matrix A, with the i-th column of Z
           !>          holding the eigenvector associated with W(i).
           !>          If JOBZ = 'N', then Z is not referenced.
           !>

           LDZ

           !>          LDZ is INTEGER
           !>          The leading dimension of the array Z.  LDZ >= 1, and if
           !>          JOBZ = 'V', LDZ >= max(1,N).
           !>

           WORK

           !>          WORK is COMPLEX*16 array, dimension (N)
           !>

           RWORK

           !>          RWORK is DOUBLE PRECISION array, dimension (max(1,3*N-2))
           !>

           INFO

           !>          INFO is INTEGER
           !>          = 0:  successful exit.
           !>          < 0:  if INFO = -i, the i-th argument had an illegal value.
           !>          > 0:  if INFO = i, the algorithm failed to converge; i
           !>                off-diagonal elements of an intermediate tridiagonal
           !>                form did not converge to zero.
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 150 of file zhbev.f.

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

LAPACK                          Version 3.12.0                  SRC/zhbev.f(3)