pbcon Interface

public interface pbcon

PBCON estimates the reciprocal of the condition number (in the 1-norm) of a complex Hermitian positive definite band matrix using the Cholesky factorization A = UHU or A = LLH computed by CPBTRF. 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 cpbcon(uplo, n, kd, ab, ldab, anorm, rcond, work, rwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kd
complex(kind=sp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
real(kind=sp), intent(in) :: anorm
real(kind=sp), intent(out) :: rcond
complex(kind=sp), intent(out) :: work(*)
real(kind=sp), intent(out) :: rwork(*)
integer(kind=ilp), intent(out) :: info

public pure subroutine dpbcon(uplo, n, kd, ab, ldab, anorm, rcond, work, iwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kd
real(kind=dp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
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 spbcon(uplo, n, kd, ab, ldab, anorm, rcond, work, iwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kd
real(kind=sp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
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 zpbcon(uplo, n, kd, ab, ldab, anorm, rcond, work, rwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kd
complex(kind=dp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
real(kind=dp), intent(in) :: anorm
real(kind=dp), intent(out) :: rcond
complex(kind=dp), intent(out) :: work(*)
real(kind=dp), intent(out) :: rwork(*)
integer(kind=ilp), intent(out) :: info

Module Procedures

public interface stdlib_cpbcon()

Arguments

None

public interface stdlib_dpbcon()

Arguments

None

public interface stdlib_spbcon()

Arguments

None

public interface stdlib_zpbcon()

Arguments

None