DecompositionOperations<TReal, TComplex>.TriangularEstimateCondition Method

Definition

Namespace: Numerics.NET.LinearAlgebra.Implementation
Assembly: Numerics.NET (in Numerics.NET.dll) Version: 9.0.3

Overload List

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, Array2D<TReal>, TReal, Int32)

Estimates the reciprocal of the condition number of a triangular matrix A, in either the 1-norm or the infinity-norm.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, Array2D<TComplex>, TReal, Int32) Approximates the reciprocal of the condition number of a complex triangular matrix.
TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, ReadOnlySpan2D<TReal>, TReal, Int32)

Estimates the reciprocal of the condition number of a triangular matrix A, in either the 1-norm or the infinity-norm.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, ReadOnlySpan2D<TComplex>, TReal, Int32) Approximates the reciprocal of the condition number of a complex triangular matrix.
TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, ReadOnlySpan<TReal>, Int32, TReal, Int32)

Estimates the reciprocal of the condition number of a triangular matrix A, in either the 1-norm or the infinity-norm.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, ReadOnlySpan<TComplex>, Int32, TReal, Int32) Approximates the reciprocal of the condition number of a complex triangular matrix.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, Array2D<TReal>, TReal, Int32)

Estimates the reciprocal of the condition number of a triangular matrix A, in either the 1-norm or the infinity-norm.

C#
public void TriangularEstimateCondition(
	MatrixNorm norm,
	MatrixTriangle storedTriangle,
	MatrixDiagonal diag,
	int n,
	Array2D<TReal> a,
	out TReal 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.
            
storedTriangle  MatrixTriangle
            = 'U':  A is upper triangular;
            = 'L':  A is lower triangular.
            
diag  MatrixDiagonal
            = 'N':  A is non-unit triangular;
            = 'U':  A is unit triangular.
            
n  Int32
            The order of the matrix A.  N >= 0.
            
a  Array2D<TReal>
            A is TReal array, dimension (LDA,N)
            The triangular matrix A.  If UPLO = 'U', the leading N-by-N
            upper triangular part of the array A contains the upper
            triangular matrix, and the strictly lower triangular part of
            A is not referenced.  If UPLO = 'L', the leading N-by-N lower
            triangular part of the array A contains the lower triangular
            matrix, and the strictly upper triangular part of A is not
            referenced.  If DIAG = 'U', the diagonal elements of A are
            also not referenced and are assumed to be 1.
            
            The leading dimension of the array A.  LDA >= max(1,N).
            
rcond  TReal
            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

            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)) ).
            

This method corresponds to the LAPACK routine ?TRCON.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, Array2D<TComplex>, TReal, Int32)

Approximates the reciprocal of the condition number of a complex triangular matrix.
C#
public void TriangularEstimateCondition(
	MatrixNorm norm,
	MatrixTriangle storedTriangle,
	MatrixDiagonal diag,
	int n,
	Array2D<TComplex> a,
	out TReal rcond,
	out int info
)

Parameters

norm  MatrixNorm
A MatrixNorm value that specifies which norm to use in the expression for the condition number.
storedTriangle  MatrixTriangle
A MatrixTriangle value that indicates whether the matrix is upper or lower triangular.
diag  MatrixDiagonal
A MatrixDiagonal value that indicates whether the matrix is unit diagonal.
n  Int32
The number of rows and columns of the matrix.
a  Array2D<TComplex>
A complex array that contains the elements of the matrix.
rcond  TReal
On return, an estimate for the reciprocal of the condition number of the matrix.
info  Int32
On return, indicates error conditions.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, ReadOnlySpan2D<TReal>, TReal, Int32)

Estimates the reciprocal of the condition number of a triangular matrix A, in either the 1-norm or the infinity-norm.

C#
public void TriangularEstimateCondition(
	MatrixNorm norm,
	MatrixTriangle storedTriangle,
	MatrixDiagonal diag,
	int n,
	ReadOnlySpan2D<TReal> a,
	out TReal 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.
            
storedTriangle  MatrixTriangle
            = 'U':  A is upper triangular;
            = 'L':  A is lower triangular.
            
diag  MatrixDiagonal
            = 'N':  A is non-unit triangular;
            = 'U':  A is unit triangular.
            
n  Int32
            The order of the matrix A.  N >= 0.
            
a  ReadOnlySpan2D<TReal>
            A is TReal array, dimension (LDA,N)
            The triangular matrix A.  If UPLO = 'U', the leading N-by-N
            upper triangular part of the array A contains the upper
            triangular matrix, and the strictly lower triangular part of
            A is not referenced.  If UPLO = 'L', the leading N-by-N lower
            triangular part of the array A contains the lower triangular
            matrix, and the strictly upper triangular part of A is not
            referenced.  If DIAG = 'U', the diagonal elements of A are
            also not referenced and are assumed to be 1.
            
            The leading dimension of the array A.  LDA >= max(1,N).
            
rcond  TReal
            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

            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)) ).
            

This method corresponds to the LAPACK routine ?TRCON.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, ReadOnlySpan2D<TComplex>, TReal, Int32)

Approximates the reciprocal of the condition number of a complex triangular matrix.
C#
public void TriangularEstimateCondition(
	MatrixNorm norm,
	MatrixTriangle storedTriangle,
	MatrixDiagonal diag,
	int n,
	ReadOnlySpan2D<TComplex> a,
	out TReal rcond,
	out int info
)

Parameters

norm  MatrixNorm
A MatrixNorm value that specifies which norm to use in the expression for the condition number.
storedTriangle  MatrixTriangle
A MatrixTriangle value that indicates whether the matrix is upper or lower triangular.
diag  MatrixDiagonal
A MatrixDiagonal value that indicates whether the matrix is unit diagonal.
n  Int32
The number of rows and columns of the matrix.
a  ReadOnlySpan2D<TComplex>
A complex array that contains the elements of the matrix.
rcond  TReal
On return, an estimate for the reciprocal of the condition number of the matrix.
info  Int32
On return, indicates error conditions.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, ReadOnlySpan<TReal>, Int32, TReal, Int32)

Estimates the reciprocal of the condition number of a triangular matrix A, in either the 1-norm or the infinity-norm.

C#
public abstract void TriangularEstimateCondition(
	MatrixNorm norm,
	MatrixTriangle storedTriangle,
	MatrixDiagonal diag,
	int n,
	ReadOnlySpan<TReal> a,
	int lda,
	out TReal 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.
            
storedTriangle  MatrixTriangle
            = 'U':  A is upper triangular;
            = 'L':  A is lower triangular.
            
diag  MatrixDiagonal
            = 'N':  A is non-unit triangular;
            = 'U':  A is unit triangular.
            
n  Int32
            The order of the matrix A.  N >= 0.
            
a  ReadOnlySpan<TReal>
            A is TReal array, dimension (LDA,N)
            The triangular matrix A.  If UPLO = 'U', the leading N-by-N
            upper triangular part of the array A contains the upper
            triangular matrix, and the strictly lower triangular part of
            A is not referenced.  If UPLO = 'L', the leading N-by-N lower
            triangular part of the array A contains the lower triangular
            matrix, and the strictly upper triangular part of A is not
            referenced.  If DIAG = 'U', the diagonal elements of A are
            also not referenced and are assumed to be 1.
            
lda  Int32
            The leading dimension of the array A.  LDA >= max(1,N).
            
rcond  TReal
            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

            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)) ).
            

This method corresponds to the LAPACK routine ?TRCON.

TriangularEstimateCondition(MatrixNorm, MatrixTriangle, MatrixDiagonal, Int32, ReadOnlySpan<TComplex>, Int32, TReal, Int32)

Approximates the reciprocal of the condition number of a complex triangular matrix.
C#
public abstract void TriangularEstimateCondition(
	MatrixNorm norm,
	MatrixTriangle storedTriangle,
	MatrixDiagonal diag,
	int n,
	ReadOnlySpan<TComplex> a,
	int lda,
	out TReal rcond,
	out int info
)

Parameters

norm  MatrixNorm
A MatrixNorm value that specifies which norm to use in the expression for the condition number.
storedTriangle  MatrixTriangle
A MatrixTriangle value that indicates whether the matrix is upper or lower triangular.
diag  MatrixDiagonal
A MatrixDiagonal value that indicates whether the matrix is unit diagonal.
n  Int32
The number of rows and columns of the matrix.
a  ReadOnlySpan<TComplex>
A complex array that contains the elements of the matrix.
lda  Int32
The leading dimension of the matrix a.
rcond  TReal
On return, an estimate for the reciprocal of the condition number of the matrix.
info  Int32
On return, indicates error conditions.

See Also