Dgbmv Dgemv Dger Dsbmv Dspmv Dspr Dspr2 Dsymv Dsyr Dsyr2 Dtbmv Dtbsv Dtpmv Dtpsv Dtrmv Dtrsv

Dsymv() Sub Dsymv ( Uplo As  String, N As  Long, Alpha As  Double, A_IJ As  Double, LdA As  Long, X_I As  Double, Beta As  Double, Y_I As  Double, Optional IncX As  Long = 1, Optional IncY As  Long = 1  ) y <- αAx + βy (symmetric matrices) (BLAS 2) Purpose This routine performs the matrix-vector operation y <- αAx + βy where α and β are scalars, x and y are vectors and A is an n x n symmetric matrix. Parameters [in] Uplo Specifies whether the upper or lower triangular part of the array A() is to be referenced as follows: = "U": Only the upper triangular part of A() is to be referenced. = "L": Only the lower triangular part of A() is to be referenced. [in] N Order of the matrix A. (N >= 0) (If N = 0, returns without computation) [in] Alpha Scalar α. [in] A_IJ An element A(I, J) of the array A(). Starting from this location, N x N symmetric matrix A is stored. Only the upper or lower triangular part is to be referenced. [in] LdA Leading dimension of the two dimensional array A(). (LdA >= max(1, N)) [in] X_I An element X(I) of the array X(). Starting from this location, N vector x is stored with element spacing IncX. [in] Beta Scalar β. When β is supplied as zero then y need not be set on input. [in,out] Y_I An element Y(I) of the array Y(). [in] Starting from this location, N vector y is stored with element spacing IncY. [out] Starting from this location, N vector αAx+βy is stored with element spacing IncY. [in] IncX (Optional) Element spacing of vector x in the array X(). (IncX <> 0) (default = 1) [in] IncY (Optional) Element spacing of vector y in the array Y(). (IncY <> 0) (default = 1) Reference BLAS