sptrd Interface

public interface sptrd

SPTRD reduces a real symmetric matrix A stored in packed form to symmetric tridiagonal form T by an orthogonal similarity transformation: Q**T * A * Q = T.


Subroutines

public pure subroutine dsptrd(uplo, n, ap, d, e, tau, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
real(kind=dp), intent(inout) :: ap(*)
real(kind=dp), intent(out) :: d(*)
real(kind=dp), intent(out) :: e(*)
real(kind=dp), intent(out) :: tau(*)
integer(kind=ilp), intent(out) :: info

public pure subroutine ssptrd(uplo, n, ap, d, e, tau, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
real(kind=sp), intent(inout) :: ap(*)
real(kind=sp), intent(out) :: d(*)
real(kind=sp), intent(out) :: e(*)
real(kind=sp), intent(out) :: tau(*)
integer(kind=ilp), intent(out) :: info

Module Procedures

public interface stdlib_dsptrd()

Arguments

None

public interface stdlib_ssptrd()

Arguments

None