gbcon Interface

public interface gbcon

GBCON estimates the reciprocal of the condition number of a complex general band matrix A, in either the 1-norm or the infinity-norm, using the LU factorization computed by CGBTRF. An estimate is obtained for norm(inv(A)), and the reciprocal of the condition number is computed as RCOND = 1 / ( norm(A) * norm(inv(A)) ).


Subroutines

public pure subroutine cgbcon(norm, n, kl, ku, ab, ldab, ipiv, anorm, rcond, work, rwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kl
integer(kind=ilp), intent(in) :: ku
complex(kind=sp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
integer(kind=ilp), intent(in) :: ipiv(*)
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 dgbcon(norm, n, kl, ku, ab, ldab, ipiv, anorm, rcond, work, iwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kl
integer(kind=ilp), intent(in) :: ku
real(kind=dp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
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 sgbcon(norm, n, kl, ku, ab, ldab, ipiv, anorm, rcond, work, iwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kl
integer(kind=ilp), intent(in) :: ku
real(kind=sp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
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 zgbcon(norm, n, kl, ku, ab, ldab, ipiv, anorm, rcond, work, rwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: kl
integer(kind=ilp), intent(in) :: ku
complex(kind=dp), intent(in) :: ab(ldab,*)
integer(kind=ilp), intent(in) :: ldab
integer(kind=ilp), intent(in) :: ipiv(*)
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_cgbcon()

Arguments

None

public interface stdlib_dgbcon()

Arguments

None

public interface stdlib_sgbcon()

Arguments

None

public interface stdlib_zgbcon()

Arguments

None