gtcon Interface

public interface gtcon

GTCON estimates the reciprocal of the condition number of a complex tridiagonal matrix A using the LU factorization as computed by CGTTRF. An estimate is obtained for norm(inv(A)), and the reciprocal of the condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).


Subroutines

public pure subroutine cgtcon(norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
integer(kind=ilp), intent(in) :: n
complex(kind=sp), intent(in) :: dl(*)
complex(kind=sp), intent(in) :: d(*)
complex(kind=sp), intent(in) :: du(*)
complex(kind=sp), intent(in) :: du2(*)
integer(kind=ilp), intent(in) :: ipiv(*)
real(kind=sp), intent(in) :: anorm
real(kind=sp), intent(out) :: rcond
complex(kind=sp), intent(out) :: work(*)
integer(kind=ilp), intent(out) :: info

public pure subroutine dgtcon(norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, iwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
integer(kind=ilp), intent(in) :: n
real(kind=dp), intent(in) :: dl(*)
real(kind=dp), intent(in) :: d(*)
real(kind=dp), intent(in) :: du(*)
real(kind=dp), intent(in) :: du2(*)
integer(kind=ilp), intent(in) :: ipiv(*)
real(kind=dp), intent(in) :: anorm
real(kind=dp), intent(out) :: rcond
real(kind=dp), intent(out) :: work(*)
integer(kind=ilp), intent(out) :: iwork(*)
integer(kind=ilp), intent(out) :: info

public pure subroutine sgtcon(norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, iwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
integer(kind=ilp), intent(in) :: n
real(kind=sp), intent(in) :: dl(*)
real(kind=sp), intent(in) :: d(*)
real(kind=sp), intent(in) :: du(*)
real(kind=sp), intent(in) :: du2(*)
integer(kind=ilp), intent(in) :: ipiv(*)
real(kind=sp), intent(in) :: anorm
real(kind=sp), intent(out) :: rcond
real(kind=sp), intent(out) :: work(*)
integer(kind=ilp), intent(out) :: iwork(*)
integer(kind=ilp), intent(out) :: info

public pure subroutine zgtcon(norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
integer(kind=ilp), intent(in) :: n
complex(kind=dp), intent(in) :: dl(*)
complex(kind=dp), intent(in) :: d(*)
complex(kind=dp), intent(in) :: du(*)
complex(kind=dp), intent(in) :: du2(*)
integer(kind=ilp), intent(in) :: ipiv(*)
real(kind=dp), intent(in) :: anorm
real(kind=dp), intent(out) :: rcond
complex(kind=dp), intent(out) :: work(*)
integer(kind=ilp), intent(out) :: info

Module Procedures

public interface stdlib_cgtcon()

Arguments

None

public interface stdlib_dgtcon()

Arguments

None

public interface stdlib_sgtcon()

Arguments

None

public interface stdlib_zgtcon()

Arguments

None