Function rgsl::blas::level2::dsyr2

pub fn dsyr2(uplo: Uplo, alpha: f64, x: &VectorF64, y: &VectorF64, A: &mut MatrixF64) -> Value

These functions compute the symmetric rank-2 update A = \alpha x y^T + \alpha y x^T + A of the symmetric matrix A. Since the matrix A is symmetric only its upper half or lower half need to be stored. When Uplo is CblasUpper then the upper triangle and diagonal of A are used, and when Uplo is CblasLower then the lower triangle and diagonal of A are used.