ManagedLapackOfSingle.BandLUEstimateCondition Method

Definition

Namespace: Numerics.NET.LinearAlgebra.Implementation
Assembly: Numerics.NET.SinglePrecision (in Numerics.NET.SinglePrecision.dll) Version: 9.0.1

Overload List

BandLUEstimateCondition(MatrixNorm, Int32, Int32, Int32, Array2D<TComplex>, Array1D<Int32>, TReal, TReal, Int32) 
BandLUEstimateCondition(MatrixNorm, Int32, Int32, Int32, ReadOnlySpan2D<TComplex>, Span<Int32>, TReal, TReal, Int32) 
BandLUEstimateCondition(MatrixNorm, Int32, Int32, Int32, Array2D<TComplex>, Array1D<Int32>, TReal, TReal, Int32)

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 ZGBTRF.

BandLUEstimateCondition(MatrixNorm, Int32, Int32, Int32, ReadOnlySpan2D<TComplex>, Span<Int32>, TReal, TReal, Int32)

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 ZGBTRF.

BandLUEstimateCondition(MatrixNorm, Int32, Int32, Int32, ReadOnlySpan<Complex<Single>>, Int32, Span<Int32>, Single, Single, Int32)

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 ZGBTRF.

BandLUEstimateCondition(MatrixNorm, Int32, Int32, Int32, ReadOnlySpan<Single>, Int32, Span<Int32>, Single, Single, Int32)

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 ZGBTRF.

BandLUEstimateCondition(MatrixNorm, Int32, Int32, Int32, ReadOnlySpan<Complex<Single>>, Int32, Span<Int32>, Single, Single, Int32)

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 ZGBTRF.

C#
public override void BandLUEstimateCondition(
	MatrixNorm norm,
	int n,
	int kl,
	int ku,
	ReadOnlySpan<Complex<float>> ab,
	int ldab,
	Span<int> ipiv,
	float anorm,
	out float rcond,
	out int info
)

Parameters

norm  MatrixNorm
            Specifies whether the 1-norm condition number or the
            infinity-norm condition number is required:
            = '1' or 'O':  1-norm;
            = 'I':         Infinity-norm.
            
n  Int32
            The order of the matrix A.  N >= 0.
            
kl  Int32
            The number of subdiagonals within the band of A.  KL >= 0.
            
ku  Int32
            The number of superdiagonals within the band of A.  KU >= 0.
            
ab  ReadOnlySpan<Complex<Single>>
            AB is TComplex array, dimension (LDAB,N)
            Details of the LU factorization of the band matrix A, as
            computed by ZGBTRF.  U is stored as an upper triangular band
            matrix with KL+KU superdiagonals in rows 1 to KL+KU+1, and
            the multipliers used during the factorization are stored in
            rows KL+KU+2 to 2*KL+KU+1.
            
ldab  Int32
            The leading dimension of the array AB.  LDAB >= 2*KL+KU+1.
            
ipiv  Span<Int32>
            Dimension (N)
            The pivot indices; for 1 <= i <= N, row i of the matrix was
            interchanged with row IPIV(i).
            
anorm  Single
            ANORM is TReal
            If NORM = '1' or 'O', the 1-norm of the original matrix A.
            If NORM = 'I', the infinity-norm of the original matrix A.
            
rcond  Single
            RCOND is TReal
            The reciprocal of the condition number of the matrix A,
            computed as RCOND = 1/(norm(A) * norm(inv(A))).
            
info  Int32
            = 0:  successful exit
            < 0: if INFO = -i, the i-th argument had an illegal value
            

Remarks

            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)) ).
            

Authors: Univ. of Tennessee, Univ. of California Berkeley, Univ. of Colorado Denver, NAG Ltd.

Date: November 2011

BandLUEstimateCondition(MatrixNorm, Int32, Int32, Int32, ReadOnlySpan<Single>, Int32, Span<Int32>, Single, Single, Int32)

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 ZGBTRF.

C#
public override void BandLUEstimateCondition(
	MatrixNorm norm,
	int n,
	int kl,
	int ku,
	ReadOnlySpan<float> ab,
	int ldab,
	Span<int> ipiv,
	float anorm,
	out float rcond,
	out int info
)

Parameters

norm  MatrixNorm
            Specifies whether the 1-norm condition number or the
            infinity-norm condition number is required:
            = '1' or 'O':  1-norm;
            = 'I':         Infinity-norm.
            
n  Int32
            The order of the matrix A.  N >= 0.
            
kl  Int32
            The number of subdiagonals within the band of A.  KL >= 0.
            
ku  Int32
            The number of superdiagonals within the band of A.  KU >= 0.
            
ab  ReadOnlySpan<Single>
            AB is TComplex array, dimension (LDAB,N)
            Details of the LU factorization of the band matrix A, as
            computed by ZGBTRF.  U is stored as an upper triangular band
            matrix with KL+KU superdiagonals in rows 1 to KL+KU+1, and
            the multipliers used during the factorization are stored in
            rows KL+KU+2 to 2*KL+KU+1.
            
ldab  Int32
            The leading dimension of the array AB.  LDAB >= 2*KL+KU+1.
            
ipiv  Span<Int32>
            Dimension (N)
            The pivot indices; for 1 <= i <= N, row i of the matrix was
            interchanged with row IPIV(i).
            
anorm  Single
            ANORM is TReal
            If NORM = '1' or 'O', the 1-norm of the original matrix A.
            If NORM = 'I', the infinity-norm of the original matrix A.
            
rcond  Single
            RCOND is TReal
            The reciprocal of the condition number of the matrix A,
            computed as RCOND = 1/(norm(A) * norm(inv(A))).
            
info  Int32
            = 0:  successful exit
            < 0: if INFO = -i, the i-th argument had an illegal value
            

Remarks

            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)) ).
            

Authors: Univ. of Tennessee, Univ. of California Berkeley, Univ. of Colorado Denver, NAG Ltd.

Date: November 2011

See Also