la_lapack::la_geamv Interface Reference

LA_GEAMV: performs one of the matrix-vector operations y := alpha*abs(A)*abs(x) + beta*abs(y), or y := alpha*abs(A)**T*abs(x) + beta*abs(y), where alpha and beta are scalars, x and y are vectors and A is an m by n matrix. This function is primarily used in calculating error bounds. To protect against underflow during evaluation, components in the resulting vector are perturbed away from zero by (N+1) times the underflow threshold. To prevent unnecessarily large errors for block-structure embedded in general matrices, "symbolically" zero components are not perturbed. A zero entry is considered "symbolic" if all multiplications involved in computing that entry have at least one zero multiplicand. More...

Public Member Functions
subroutine	cla_geamv (trans, m, n, alpha, a, lda, x, incx, beta, y, incy)
	la_cla_geamv
subroutine	dla_geamv (trans, m, n, alpha, a, lda, x, incx, beta, y, incy)
	la_dla_geamv
	la_qla_geamv
subroutine	sla_geamv (trans, m, n, alpha, a, lda, x, incx, beta, y, incy)
	la_sla_geamv
	la_wla_geamv
subroutine	zla_geamv (trans, m, n, alpha, a, lda, x, incx, beta, y, incy)
	la_zla_geamv

Detailed Description

LA_GEAMV: performs one of the matrix-vector operations y := alpha*abs(A)*abs(x) + beta*abs(y), or y := alpha*abs(A)**T*abs(x) + beta*abs(y), where alpha and beta are scalars, x and y are vectors and A is an m by n matrix. This function is primarily used in calculating error bounds. To protect against underflow during evaluation, components in the resulting vector are perturbed away from zero by (N+1) times the underflow threshold. To prevent unnecessarily large errors for block-structure embedded in general matrices, "symbolically" zero components are not perturbed. A zero entry is considered "symbolic" if all multiplications involved in computing that entry have at least one zero multiplicand.

Member Function/Subroutine Documentation

cla_geamv()

subroutine la_lapack::la_geamv::cla_geamv	(	integer(ilp), intent(in)	trans,
		integer(ilp), intent(in)	m,
		integer(ilp), intent(in)	n,
		real(sp), intent(in)	alpha,
		complex(sp), dimension(lda,*), intent(in)	a,
		integer(ilp), intent(in)	lda,
		complex(sp), dimension(*), intent(in)	x,
		integer(ilp), intent(in)	incx,
		real(sp), intent(in)	beta,
		real(sp), dimension(*), intent(inout)	y,
		integer(ilp), intent(in)	incy
	)

dla_geamv()

subroutine la_lapack::la_geamv::dla_geamv	(	integer(ilp), intent(in)	trans,
		integer(ilp), intent(in)	m,
		integer(ilp), intent(in)	n,
		real(dp), intent(in)	alpha,
		real(dp), dimension(lda,*), intent(in)	a,
		integer(ilp), intent(in)	lda,
		real(dp), dimension(*), intent(in)	x,
		integer(ilp), intent(in)	incx,
		real(dp), intent(in)	beta,
		real(dp), dimension(*), intent(inout)	y,
		integer(ilp), intent(in)	incy
	)

la_cla_geamv()

la_lapack::la_geamv::la_cla_geamv

la_dla_geamv()

la_lapack::la_geamv::la_dla_geamv

la_qla_geamv()

la_lapack::la_geamv::la_qla_geamv

la_sla_geamv()

la_lapack::la_geamv::la_sla_geamv

la_wla_geamv()

la_lapack::la_geamv::la_wla_geamv

la_zla_geamv()

la_lapack::la_geamv::la_zla_geamv

sla_geamv()

subroutine la_lapack::la_geamv::sla_geamv	(	integer(ilp), intent(in)	trans,
		integer(ilp), intent(in)	m,
		integer(ilp), intent(in)	n,
		real(sp), intent(in)	alpha,
		real(sp), dimension(lda,*), intent(in)	a,
		integer(ilp), intent(in)	lda,
		real(sp), dimension(*), intent(in)	x,
		integer(ilp), intent(in)	incx,
		real(sp), intent(in)	beta,
		real(sp), dimension(*), intent(inout)	y,
		integer(ilp), intent(in)	incy
	)

zla_geamv()

subroutine la_lapack::la_geamv::zla_geamv	(	integer(ilp), intent(in)	trans,
		integer(ilp), intent(in)	m,
		integer(ilp), intent(in)	n,
		real(dp), intent(in)	alpha,
		complex(dp), dimension(lda,*), intent(in)	a,
		integer(ilp), intent(in)	lda,
		complex(dp), dimension(*), intent(in)	x,
		integer(ilp), intent(in)	incx,
		real(dp), intent(in)	beta,
		real(dp), dimension(*), intent(inout)	y,
		integer(ilp), intent(in)	incy
	)

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The documentation for this interface was generated from the following file:

• la_lapack.f90