ManagedLinearAlgebraOperations.BandSymmetricMultiplyAndAddInPlace Method

public override void BandSymmetricMultiplyAndAddInPlace(
	MatrixTriangle storedTriangle,
	int n,
	int k,
	double alpha,
	ReadOnlySpan<double> a,
	int lda,
	ReadOnlySpan<double> x,
	int incx,
	double beta,
	Span<double> y,
	int incy
)

Public Overrides Sub BandSymmetricMultiplyAndAddInPlace ( 
	storedTriangle As MatrixTriangle,
	n As Integer,
	k As Integer,
	alpha As Double,
	a As ReadOnlySpan(Of Double),
	lda As Integer,
	x As ReadOnlySpan(Of Double),
	incx As Integer,
	beta As Double,
	y As Span(Of Double),
	incy As Integer
)

public:
virtual void BandSymmetricMultiplyAndAddInPlace(
	MatrixTriangle storedTriangle, 
	int n, 
	int k, 
	double alpha, 
	ReadOnlySpan<double> a, 
	int lda, 
	ReadOnlySpan<double> x, 
	int incx, 
	double beta, 
	Span<double> y, 
	int incy
) override

abstract BandSymmetricMultiplyAndAddInPlace : 
        storedTriangle : MatrixTriangle * 
        n : int * 
        k : int * 
        alpha : float * 
        a : ReadOnlySpan<float> * 
        lda : int * 
        x : ReadOnlySpan<float> * 
        incx : int * 
        beta : float * 
        y : Span<float> * 
        incy : int -> unit 
override BandSymmetricMultiplyAndAddInPlace : 
        storedTriangle : MatrixTriangle * 
        n : int * 
        k : int * 
        alpha : float * 
        a : ReadOnlySpan<float> * 
        lda : int * 
        x : ReadOnlySpan<float> * 
        incx : int * 
        beta : float * 
        y : Span<float> * 
        incy : int -> unit 

Parameters

storedTriangle  MatrixTriangle

Specifies whether the matrix is an upper or lower triangular matrix.

n  Int32

             On entry, N specifies the order of the matrix A.
             N must be at least zero.
            

k  Int32

             On entry, K specifies the number of super-diagonals of the
             matrix A. K must satisfy  0 .le. K.
            

alpha  Double

            ALPHA is DOUBLE PRECISION.
             On entry, ALPHA specifies the scalar alpha.
            

a  ReadOnlySpan<Double>

            A is DOUBLE PRECISION array of DIMENSION ( LDA, n ).
             Before entry with UPLO = 'U' or 'u', the leading ( k + 1 )
             by n part of the array A must contain the upper triangular
             band part of the symmetric matrix, supplied column by
             column, with the leading diagonal of the matrix in row
             ( k + 1 ) of the array, the first super-diagonal starting at
             position 2 in row k, and so on. The top left k by k triangle
             of the array A is not referenced.
             The following program segment will transfer the upper
             triangular part of a symmetric band matrix from conventional
             full matrix storage to band storage:
                   DO 20, J = 1, N
                      M = K + 1 - J
                      DO 10, I = MAX( 1, J - K ), J
                         A( M + I, J ) = matrix( I, J )
                10    CONTINUE
                20 CONTINUE
             Before entry with UPLO = 'L' or 'l', the leading ( k + 1 )
             by n part of the array A must contain the lower triangular
             band part of the symmetric matrix, supplied column by
             column, with the leading diagonal of the matrix in row 1 of
             the array, the first sub-diagonal starting at position 1 in
             row 2, and so on. The bottom right k by k triangle of the
             array A is not referenced.
             The following program segment will transfer the lower
             triangular part of a symmetric band matrix from conventional
             full matrix storage to band storage:
                   DO 20, J = 1, N
                      M = 1 - J
                      DO 10, I = J, MIN( N, J + K )
                         A( M + I, J ) = matrix( I, J )
                10    CONTINUE
                20 CONTINUE
            

lda  Int32

             On entry, LDA specifies the first dimension of A as declared
             in the calling (sub) program. LDA must be at least
             ( k + 1 ).
            

x  ReadOnlySpan<Double>

            X is DOUBLE PRECISION array of DIMENSION at least
             ( 1 + ( n - 1 )*abs( INCX ) ).
             Before entry, the incremented array X must contain the
             vector x.
            

incx  Int32

             On entry, INCX specifies the increment for the elements of
             X. INCX must not be zero.
            

beta  Double

            BETA is DOUBLE PRECISION.
             On entry, BETA specifies the scalar beta.
            

y  Span<Double>

            Y is DOUBLE PRECISION array of DIMENSION at least
             ( 1 + ( n - 1 )*abs( INCY ) ).
             Before entry, the incremented array Y must contain the
             vector y. On exit, Y is overwritten by the updated vector y.
            

incy  Int32

             On entry, INCY specifies the increment for the elements of
             Y. INCY must not be zero.
            

Implements

 Further Details:
            Level 2 LinearAlgebra routine.
            The vector and matrix arguments are not referenced when N = 0, or M = 0
            -- Written on 22-October-1986.
               Jack Dongarra, Argonne National Lab.
               Jeremy Du Croz, Nag Central Office.
               Sven Hammarling, Nag Central Office.
               Richard Hanson, Sandia National Labs.
            
Authors: 
             Univ. of Tennessee,
             Univ. of California Berkeley,
             Univ. of Colorado Denver,
             NAG Ltd.
Date:  November 2011

Reference