trcon Interface

public interface trcon

TRCON estimates the reciprocal of the condition number of a triangular matrix A, in either the 1-norm or the infinity-norm. The norm of A is computed and an estimate is obtained for norm(inv(A)), then the reciprocal of the condition number is computed as RCOND = 1 / ( norm(A) * norm(inv(A)) ).


Subroutines

public subroutine ctrcon(norm, uplo, diag, n, a, lda, rcond, work, rwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
character(len=1), intent(in) :: uplo
character(len=1), intent(in) :: diag
integer(kind=ilp), intent(in) :: n
complex(kind=sp), intent(in) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
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 subroutine dtrcon(norm, uplo, diag, n, a, lda, rcond, work, iwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
character(len=1), intent(in) :: uplo
character(len=1), intent(in) :: diag
integer(kind=ilp), intent(in) :: n
real(kind=dp), intent(in) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
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 subroutine strcon(norm, uplo, diag, n, a, lda, rcond, work, iwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
character(len=1), intent(in) :: uplo
character(len=1), intent(in) :: diag
integer(kind=ilp), intent(in) :: n
real(kind=sp), intent(in) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
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 subroutine ztrcon(norm, uplo, diag, n, a, lda, rcond, work, rwork, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: norm
character(len=1), intent(in) :: uplo
character(len=1), intent(in) :: diag
integer(kind=ilp), intent(in) :: n
complex(kind=dp), intent(in) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
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_ctrcon()

Arguments

None

public interface stdlib_dtrcon()

Arguments

None

public interface stdlib_strcon()

Arguments

None

public interface stdlib_ztrcon()

Arguments

None