gehrd Interface

public interface gehrd

GEHRD reduces a complex general matrix A to upper Hessenberg form H by an unitary similarity transformation: Q**H * A * Q = H .

Subroutines

public pure subroutine cgehrd(n, ilo, ihi, a, lda, tau, work, lwork, info)

Arguments

Type	Intent	Optional	Attributes		Name
integer(kind=ilp),	intent(in)			::	n
integer(kind=ilp),	intent(in)			::	ilo
integer(kind=ilp),	intent(in)			::	ihi
complex(kind=sp),	intent(inout)			::	a(lda,*)
integer(kind=ilp),	intent(in)			::	lda
complex(kind=sp),	intent(out)			::	tau(*)
complex(kind=sp),	intent(out)			::	work(*)
integer(kind=ilp),	intent(in)			::	lwork
integer(kind=ilp),	intent(out)			::	info

public pure subroutine dgehrd(n, ilo, ihi, a, lda, tau, work, lwork, info)

Arguments

Type	Intent	Optional	Attributes		Name
integer(kind=ilp),	intent(in)			::	n
integer(kind=ilp),	intent(in)			::	ilo
integer(kind=ilp),	intent(in)			::	ihi
real(kind=dp),	intent(inout)			::	a(lda,*)
integer(kind=ilp),	intent(in)			::	lda
real(kind=dp),	intent(out)			::	tau(*)
real(kind=dp),	intent(out)			::	work(*)
integer(kind=ilp),	intent(in)			::	lwork
integer(kind=ilp),	intent(out)			::	info

public pure subroutine sgehrd(n, ilo, ihi, a, lda, tau, work, lwork, info)

Arguments

Type	Intent	Optional	Attributes		Name
integer(kind=ilp),	intent(in)			::	n
integer(kind=ilp),	intent(in)			::	ilo
integer(kind=ilp),	intent(in)			::	ihi
real(kind=sp),	intent(inout)			::	a(lda,*)
integer(kind=ilp),	intent(in)			::	lda
real(kind=sp),	intent(out)			::	tau(*)
real(kind=sp),	intent(out)			::	work(*)
integer(kind=ilp),	intent(in)			::	lwork
integer(kind=ilp),	intent(out)			::	info

public pure subroutine zgehrd(n, ilo, ihi, a, lda, tau, work, lwork, info)

Arguments

Type	Intent	Optional	Attributes		Name
integer(kind=ilp),	intent(in)			::	n
integer(kind=ilp),	intent(in)			::	ilo
integer(kind=ilp),	intent(in)			::	ihi
complex(kind=dp),	intent(inout)			::	a(lda,*)
integer(kind=ilp),	intent(in)			::	lda
complex(kind=dp),	intent(out)			::	tau(*)
complex(kind=dp),	intent(out)			::	work(*)
integer(kind=ilp),	intent(in)			::	lwork
integer(kind=ilp),	intent(out)			::	info

Module Procedures

public interface stdlib_cgehrd()

Arguments

None

public interface stdlib_dgehrd()

Arguments

None

public interface stdlib_sgehrd()

Arguments

None

public interface stdlib_zgehrd()

Arguments

None