dgbmv dgemv dger dsbmv dspmv dspr dspr2 dsymv dsyr dsyr2 dtbmv dtbsv dtpmv dtpsv dtrmv dtrsv

dsymv() void dsymv ( char  uplo, int  n, double  alpha, int  lda, double  a[], double  x[], int  incx, double  beta, double  y[], int  incy  ) y <- αAx + βy (symmetric matrices) (BLAS 2) Purpose This routine performs the matrix-vector operation y <- alpha*A*x + beta*y where alpha and beta 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 alpha. [in] lda Leading dimension of the two dimensional array a[][]. (lda >= max(1, n)) [in] a[][] Array a[la][lda] (la >= n) n x n symmetric matrix A. (Only upper or lower triangular part is to be referenced) [in] x[] Array x[lx] (lx >= 1 + (n - 1)*abs(incx)) Input vector x. [in] incx Storage spacing between elements of x. (incx != 0) [in] beta Scalar beta. When beta is supplied as zero then y[] need not be set on input. [in,out] y[] Array y[ly] (ly >= 1 + (n - 1)*abs(incy)) [in] Input vector y. [out] Output vector. (= alpha*A*x + beta*y) [in] incy Storage spacing between elements of y. (incy != 0) Reference BLAS