lahqr Interface

public interface lahqr

LAHQR is an auxiliary routine called by CHSEQR to update the eigenvalues and Schur decomposition already computed by CHSEQR, by dealing with the Hessenberg submatrix in rows and columns ILO to IHI.

Subroutines

public pure subroutine clahqr(wantt, wantz, n, ilo, ihi, h, ldh, w, iloz, ihiz, z, ldz, info)

Arguments

Type	Intent	Optional	Attributes		Name
logical(kind=lk),	intent(in)			::	wantt
logical(kind=lk),	intent(in)			::	wantz
integer(kind=ilp),	intent(in)			::	n
integer(kind=ilp),	intent(in)			::	ilo
integer(kind=ilp),	intent(in)			::	ihi
complex(kind=sp),	intent(inout)			::	h(ldh,*)
integer(kind=ilp),	intent(in)			::	ldh
complex(kind=sp),	intent(out)			::	w(*)
integer(kind=ilp),	intent(in)			::	iloz
integer(kind=ilp),	intent(in)			::	ihiz
complex(kind=sp),	intent(inout)			::	z(ldz,*)
integer(kind=ilp),	intent(in)			::	ldz
integer(kind=ilp),	intent(out)			::	info

public pure subroutine dlahqr(wantt, wantz, n, ilo, ihi, h, ldh, wr, wi, iloz, ihiz, z, ldz, info)

Arguments

Type	Intent	Optional	Attributes		Name
logical(kind=lk),	intent(in)			::	wantt
logical(kind=lk),	intent(in)			::	wantz
integer(kind=ilp),	intent(in)			::	n
integer(kind=ilp),	intent(in)			::	ilo
integer(kind=ilp),	intent(in)			::	ihi
real(kind=dp),	intent(inout)			::	h(ldh,*)
integer(kind=ilp),	intent(in)			::	ldh
real(kind=dp),	intent(out)			::	wr(*)
real(kind=dp),	intent(out)			::	wi(*)
integer(kind=ilp),	intent(in)			::	iloz
integer(kind=ilp),	intent(in)			::	ihiz
real(kind=dp),	intent(inout)			::	z(ldz,*)
integer(kind=ilp),	intent(in)			::	ldz
integer(kind=ilp),	intent(out)			::	info

public pure subroutine slahqr(wantt, wantz, n, ilo, ihi, h, ldh, wr, wi, iloz, ihiz, z, ldz, info)

Arguments

Type	Intent	Optional	Attributes		Name
logical(kind=lk),	intent(in)			::	wantt
logical(kind=lk),	intent(in)			::	wantz
integer(kind=ilp),	intent(in)			::	n
integer(kind=ilp),	intent(in)			::	ilo
integer(kind=ilp),	intent(in)			::	ihi
real(kind=sp),	intent(inout)			::	h(ldh,*)
integer(kind=ilp),	intent(in)			::	ldh
real(kind=sp),	intent(out)			::	wr(*)
real(kind=sp),	intent(out)			::	wi(*)
integer(kind=ilp),	intent(in)			::	iloz
integer(kind=ilp),	intent(in)			::	ihiz
real(kind=sp),	intent(inout)			::	z(ldz,*)
integer(kind=ilp),	intent(in)			::	ldz
integer(kind=ilp),	intent(out)			::	info

public pure subroutine zlahqr(wantt, wantz, n, ilo, ihi, h, ldh, w, iloz, ihiz, z, ldz, info)

Arguments

Type	Intent	Optional	Attributes		Name
logical(kind=lk),	intent(in)			::	wantt
logical(kind=lk),	intent(in)			::	wantz
integer(kind=ilp),	intent(in)			::	n
integer(kind=ilp),	intent(in)			::	ilo
integer(kind=ilp),	intent(in)			::	ihi
complex(kind=dp),	intent(inout)			::	h(ldh,*)
integer(kind=ilp),	intent(in)			::	ldh
complex(kind=dp),	intent(out)			::	w(*)
integer(kind=ilp),	intent(in)			::	iloz
integer(kind=ilp),	intent(in)			::	ihiz
complex(kind=dp),	intent(inout)			::	z(ldz,*)
integer(kind=ilp),	intent(in)			::	ldz
integer(kind=ilp),	intent(out)			::	info

Module Procedures

public interface stdlib_clahqr()

Arguments

None

public interface stdlib_dlahqr()

Arguments

None

public interface stdlib_slahqr()

Arguments

None

public interface stdlib_zlahqr()

Arguments

None