Computes a rank-2 update of a symmetric matrix.
void syr2(queue &exec_queue, uplo upper_lower, std::int64_t n, T alpha, buffer<T,1> &x, std::int64_t incx, buffer<T,1> &y, std::int64_t incy, buffer<T,1> &a, std::int64_t lda);
syr2 supports the following precisions and devices.
T | Devices Supported |
---|---|
float | Host, CPU, and GPU |
double | Host, CPU, and GPU |
The syr2 routines compute two scalar-vector-vector product add them and add the result to a matrix, with a symmetric matrix. The operation is defined as
A <- alpha*x*yT + alpha*y*xT + A
where:
alpha is a scalar,
A is an n-by-n symmetric matrix,
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 columns of A. Must be at least zero.
Scaling factor for the matrix-vector product.
Buffer holding input vector x. The buffer must be of size at least (1 + (n - 1)*abs(incx)). See Matrix and Vector Storage for more details.
Stride of vector x.
Buffer holding input/output vector y. The buffer must be of size at least (1 + (n - 1)*abs(incy)). See Matrix and Vector Storage for more details.
Stride of vector y.
Buffer holding input matrix A. Must have size at least lda*n. See Matrix and Vector Storage for more details.
Leading dimension of matrix A. Must be at least n, and positive.
Buffer holding 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.