stedc Interface

public interface stedc

STEDC computes all eigenvalues and, optionally, eigenvectors of a symmetric tridiagonal matrix using the divide and conquer method. The eigenvectors of a full or band complex Hermitian matrix can also be found if CHETRD or CHPTRD or CHBTRD has been used to reduce this matrix to tridiagonal form. This code 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. See SLAED3 for details.


Subroutines

public pure subroutine cstedc(compz, n, d, e, z, ldz, work, lwork, rwork, lrwork, iwork, liwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: compz
integer(kind=ilp), intent(in) :: n
real(kind=sp), intent(inout) :: d(*)
real(kind=sp), intent(inout) :: e(*)
complex(kind=sp), intent(inout) :: 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 pure subroutine dstedc(compz, n, d, e, z, ldz, work, lwork, iwork, liwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: compz
integer(kind=ilp), intent(in) :: n
real(kind=dp), intent(inout) :: d(*)
real(kind=dp), intent(inout) :: e(*)
real(kind=dp), intent(inout) :: z(ldz,*)
integer(kind=ilp), intent(in) :: ldz
real(kind=dp), intent(out) :: work(*)
integer(kind=ilp), intent(in) :: lwork
integer(kind=ilp), intent(out) :: iwork(*)
integer(kind=ilp), intent(in) :: liwork
integer(kind=ilp), intent(out) :: info

public pure subroutine sstedc(compz, n, d, e, z, ldz, work, lwork, iwork, liwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: compz
integer(kind=ilp), intent(in) :: n
real(kind=sp), intent(inout) :: d(*)
real(kind=sp), intent(inout) :: e(*)
real(kind=sp), intent(inout) :: z(ldz,*)
integer(kind=ilp), intent(in) :: ldz
real(kind=sp), intent(out) :: work(*)
integer(kind=ilp), intent(in) :: lwork
integer(kind=ilp), intent(out) :: iwork(*)
integer(kind=ilp), intent(in) :: liwork
integer(kind=ilp), intent(out) :: info

public pure subroutine zstedc(compz, n, d, e, z, ldz, work, lwork, rwork, lrwork, iwork, liwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: compz
integer(kind=ilp), intent(in) :: n
real(kind=dp), intent(inout) :: d(*)
real(kind=dp), intent(inout) :: e(*)
complex(kind=dp), intent(inout) :: 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_cstedc()

Arguments

None

public interface stdlib_dstedc()

Arguments

None

public interface stdlib_sstedc()

Arguments

None

public interface stdlib_zstedc()

Arguments

None