hbevd Interface

public interface hbevd

HBEVD computes all the eigenvalues and, optionally, eigenvectors of a complex Hermitian band matrix A. If eigenvectors are desired, it uses a divide and conquer algorithm. The divide and conquer algorithm makes very mild assumptions about floating point arithmetic. It will work on machines with a guard digit in add/subtract, or on those binary machines without guard digits which subtract like the Cray X-MP, Cray Y-MP, Cray C-90, or Cray-2. It could conceivably fail on hexadecimal or decimal machines without guard digits, but we know of none.


Subroutines

public subroutine chbevd(jobz, uplo, n, kd, ab, ldab, w, z, ldz, work, lwork, rwork, lrwork, iwork, liwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: jobz
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kd
complex(kind=sp), intent(inout) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
real(kind=sp), intent(out) :: w(*)
complex(kind=sp), intent(out) :: z(ldz,*)
integer(kind=ilp), intent(in) :: ldz
complex(kind=sp), intent(out) :: work(*)
integer(kind=ilp), intent(in) :: lwork
real(kind=sp), intent(out) :: rwork(*)
integer(kind=ilp), intent(in) :: lrwork
integer(kind=ilp), intent(out) :: iwork(*)
integer(kind=ilp), intent(in) :: liwork
integer(kind=ilp), intent(out) :: info

public subroutine zhbevd(jobz, uplo, n, kd, ab, ldab, w, z, ldz, work, lwork, rwork, lrwork, iwork, liwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: jobz
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kd
complex(kind=dp), intent(inout) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
real(kind=dp), intent(out) :: w(*)
complex(kind=dp), intent(out) :: z(ldz,*)
integer(kind=ilp), intent(in) :: ldz
complex(kind=dp), intent(out) :: work(*)
integer(kind=ilp), intent(in) :: lwork
real(kind=dp), intent(out) :: rwork(*)
integer(kind=ilp), intent(in) :: lrwork
integer(kind=ilp), intent(out) :: iwork(*)
integer(kind=ilp), intent(in) :: liwork
integer(kind=ilp), intent(out) :: info

Module Procedures

public interface stdlib_chbevd()

Arguments

None

public interface stdlib_zhbevd()

Arguments

None