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scal

Computes the product of a vector by a scalar.

Description

The scal routines computes a scalar-vector product. The operation is defined as:

where:

• x is a vector of n elements

• alpha is a scalar

scal supports the following precisions:

T	T_scalar
float	float
double	double
std::complex<float>	std::complex<float>
std::complex<double>	std::complex<double>
std::complex<float>	float
std::complex<double>	double

scal (Buffer Version)

Syntax

namespace oneapi::mkl::blas::column_major {
    void scal(sycl::queue &queue,
              std::int64_t n,
              T_scalar alpha,
              sycl::buffer<T,1> &x,
              std::int64_t incx)
}

namespace oneapi::mkl::blas::row_major {
    void scal(sycl::queue &queue,
              std::int64_t n,
              T_scalar alpha,
              sycl::buffer<T,1> &x,
              std::int64_t incx)
}

Input Parameters

queue

The queue where the routine should be executed.

n

Number of elements in vector x.

alpha

Specifies the scalar alpha.

x

Buffer holding input vector x. Size of the buffer must be at least (1 + (n - 1)*abs(incx)). See ref:matrix-storage for more details.

incx

Stride of vector x.

Output Parameters

x

Buffer holding updated buffer x.

scal (USM Version)

Syntax

namespace oneapi::mkl::blas::column_major {
    sycl::event scal(sycl::queue &queue,
                     std::int64_t n,
                     T_scalar alpha,
                     T *x,
                     std::int64_t incx,
                     const std::vector<sycl::event> &dependencies = {})
}

namespace oneapi::mkl::blas::row_major {
    sycl::event scal(sycl::queue &queue,
                     std::int64_t n,
                     T_scalar alpha,
                     T *x,
                     std::int64_t incx,
                     const std::vector<sycl::event> &dependencies = {})
}

Input Parameters

queue

The queue where the routine should be executed.

n

Number of elements in vector x.

alpha

Specifies the scalar alpha.

x

Pointer to the input vector x. Size of the array must be at least (1 + (n - 1)*abs(incx)). See ref:matrix-storage for more details.

incx

Stride of vector x.

Output Parameters

x

Pointer to updated array x.

Return Values

Output event to wait on to ensure computation is complete.

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