ppcon Interface

public interface ppcon

PPCON estimates the reciprocal of the condition number (in the 1-norm) of a complex Hermitian positive definite packed matrix using the Cholesky factorization A = UHU or A = LLH computed by CPPTRF. 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 cppcon(uplo, n, ap, anorm, rcond, work, rwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
complex(kind=sp), intent(in) :: ap(*)
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 dppcon(uplo, n, ap, anorm, rcond, work, iwork, info)

Arguments

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

Arguments

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

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
complex(kind=dp), intent(in) :: ap(*)
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_cppcon()

Arguments

None

public interface stdlib_dppcon()

Arguments

None

public interface stdlib_sppcon()

Arguments

None

public interface stdlib_zppcon()

Arguments

None