Performs a rank-1 update of a symmetric packed matrix.
event spr(queue &exec_queue, uplo upper_lower, std::int64_t n, T alpha, const T *x, std::int64_t incx, T *a, const vector_class<event> &dependencies = {});
The USM version of spr supports the following precisions and devices.
T | Devices Supported |
---|---|
float | Host, CPU, and GPU |
double | Host, CPU, and GPU |
The spr routines compute a scalar-vector-vector product and add the result to a symmetric packed matrix. The operation is defined as
A <- alpha*x*xT + A
where:
alpha is scalar,
A is an n-by-n symmetric matrix, supplied in packed form,
x is a vector 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 matrix A. The array holding input matrix A must have size at least (n*(n-n))/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.