Computes a rank-2 update of a symmetric packed matrix.
event spr2(queue &exec_queue, uplo upper_lower, std::int64_t n, T alpha, const T *x, std::int64_t incx, const T *y, std::int64_t incy, T *a);
The USM version of spr2 supports the following precisions and devices.
T | Devices Supported |
---|---|
float | Host, CPU, and GPU |
double | Host, CPU, and GPU |
The spr2 routines compute two scalar-vector-vector products and add them to a symmetric packed matrix. The operation is defined as
A <- alpha*x*yT + alpha*y*xT + A
where:
alpha is scalar,
A is an n-by-n symmetric matrix, supplied in packed form,
x and y are vectors of length n.
The queue where the routine should be executed.
Specifies whether A is upper or lower triangular. See Data Types for more details.
Number of rows and columns of A. Must be at least zero.
Scaling factor for the matrix-vector product.
Pointer to input vector x. The array holding input vector x must be of size at least (1 + (n - 1)*abs(incx)). See Matrix and Vector Storage for more details.
Stride of vector x.
Pointer to input/output vector y. The array holding input/output vector y must be of size at least (1 + (n - 1)*abs(incy)). See Matrix and Vector Storage for more details.
Stride of vector y.
Pointer to input matrix A. The array holding input matrix A must have size at least (n*(n-1))/2. See Matrix and Vector Storage for more details.
List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies.
Pointer to the updated upper triangular part of the symmetric matrix A if upper_lower = upper or the updated lower triangular part of the symmetric matrix A if upper_lower = lower.
Output event to wait on to ensure computation is complete.