la_gbamv Interface

public interface la_gbamv

LA_GBAMV performs one of the matrix-vector operations y := alphaabs(A)abs(x) + betaabs(y), or y := alphaabs(A)Tabs(x) + betaabs(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.


Subroutines

public subroutine cla_gbamv(trans, m, n, kl, ku, alpha, ab, ldab, x, incx, beta, y, incy)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: trans
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kl
integer(kind=ilp), intent(in) :: ku
real(kind=sp), intent(in) :: alpha
complex(kind=sp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
complex(kind=sp), intent(in) :: x(*)
integer(kind=ilp), intent(in) :: incx
real(kind=sp), intent(in) :: beta
real(kind=sp), intent(inout) :: y(*)
integer(kind=ilp), intent(in) :: incy

public subroutine dla_gbamv(trans, m, n, kl, ku, alpha, ab, ldab, x, incx, beta, y, incy)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: trans
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kl
integer(kind=ilp), intent(in) :: ku
real(kind=dp), intent(in) :: alpha
real(kind=dp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
real(kind=dp), intent(in) :: x(*)
integer(kind=ilp), intent(in) :: incx
real(kind=dp), intent(in) :: beta
real(kind=dp), intent(inout) :: y(*)
integer(kind=ilp), intent(in) :: incy

public subroutine sla_gbamv(trans, m, n, kl, ku, alpha, ab, ldab, x, incx, beta, y, incy)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: trans
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kl
integer(kind=ilp), intent(in) :: ku
real(kind=sp), intent(in) :: alpha
real(kind=sp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
real(kind=sp), intent(in) :: x(*)
integer(kind=ilp), intent(in) :: incx
real(kind=sp), intent(in) :: beta
real(kind=sp), intent(inout) :: y(*)
integer(kind=ilp), intent(in) :: incy

public subroutine zla_gbamv(trans, m, n, kl, ku, alpha, ab, ldab, x, incx, beta, y, incy)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: trans
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kl
integer(kind=ilp), intent(in) :: ku
real(kind=dp), intent(in) :: alpha
complex(kind=dp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
complex(kind=dp), intent(in) :: x(*)
integer(kind=ilp), intent(in) :: incx
real(kind=dp), intent(in) :: beta
real(kind=dp), intent(inout) :: y(*)
integer(kind=ilp), intent(in) :: incy

Module Procedures

public interface stdlib_cla_gbamv()

Arguments

None

public interface stdlib_dla_gbamv()

Arguments

None

public interface stdlib_sla_gbamv()

Arguments

None

public interface stdlib_zla_gbamv()

Arguments

None