zgbmv zgemv zgerc zgeru zhbmv zhemv zher zher2 zhpmv zhpr zhpr2 zsbmv zspmv zspr zspr2 zsymv zsyr zsyr2 ztbmv ztbsv ztpmv ztpsv ztrmv ztrsv

zher2() void zher2 ( char  uplo, int  n, doublecomplex  alpha, doublecomplex  x[], int  incx, doublecomplex  y[], int  incy, int  lda, doublecomplex  a[]  ) Rank 2 operation: A <- αxyH + conjg(α)yxH + A (Hermitian matrices) (BLAS 2) Purpose This routine performs the Hermitian rank 2 operation A <- alpha*x*y^H + conjg(alpha)*y*x^H + A where alpha is a scalar, x and y are n element vectors and A is an n x n Hermitian 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] x[] Array x[lx] (lx >= 1 + (n - 1)*abs(incx)) Vector x. [in] incx Storage spacing between elements of x. (incx != 0) [in] y[] Array y[ly] (ly >= 1 + (n - 1)*abs(incy)) Vector y. [in] incy Storage spacing between elements of y. (incy != 0) [in] lda Leading dimension of the two dimensional array a[][]. (lda >= max(1, n)) [in,out] a[][] Array a[la][lda] (la >= n) [in] n x n Hermitian matrix A. According to uplo, only upper or lower triangular part is to be referenced. The imaginary parts of the diagonal elements need not be set and are assumed to be zero. [out] Output matrix (= alpha*x*y^H + conjg(alpha)*y*x^H + A). According to uplo, only upper or lower triangular part is overwritten. The imaginary parts of the diagonal elements are set to zero. Reference BLAS