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Calculates the product of a symmetric matrix and a vector.

Details  

	A is a real symmetric matrix. The VI multiplies the first N rows and N columns of the triangular component of A that you select for matrix A type by X, where N is the number of elements in X. A must have at least N rows and N columns.
	x is an N–element real vector.
	y is a real vector with at least N elements. The default is a vector with N elements, all equal to 0.
	matrix A type specifies whether the VI uses the upper or lower triangular component of A for the calculation. 2 Lower Triangular—The VI uses the lower triangular component of A for the calculation. 3 Upper Triangular (default)—The VI uses the upper triangular component of A for the calculation.
	alpha is a real scalar that scales A*x. The default is 1.
	beta is a real scalar that scales y. The default is 1.
	dsymv is a real vector of the same size as y. For the first N elements, dsymv returns the result of alpha*A*x + beta*y. For any remaining elements, dsymv returns the value of the element in y with the same index.
	error returns any error or warning from the VI. You can wire error to the Error Cluster From Error Code VI to convert the error code or warning into an error cluster.

dsymv - Symmetric Matrix-Vector Product (DBL) Details

Refer to BLAS (Basic Linear Algebra Subprograms) for more information on the BLAS functions.