iamin
Finds the index of the element with the smallest absolute value in a vector
Description
The
iamin
routines return an index i
such that x[i]
has
the minimum absolute value of all elements in vector x
(real
variants), or such that (|Re(x[i]
)| + |Im(x[i]
)|) is minimal (complex variants).iamin
supports the following precisions:T |
---|
float |
double |
std::complex<float> |
std::complex<double> |
The index is zero-based.
If either
n
or incx
are not positive, the routine returns 0
.If more than one vector element is found with the same smallest
absolute value, the index of the first one encountered is returned.
If the vector contains
NaN
values, then the routine returns the
index of the first NaN
.iamin (Buffer Version)
Syntax
namespace oneapi::mkl::blas::column_major {
void iamin(sycl::queue &queue,
std::int64_t n,
sycl::buffer<T,1> &x,
std::int64_t incx,
sycl::buffer<std::int64_t,1> &result)
}
namespace oneapi::mkl::blas::row_major {
void iamin(sycl::queue &queue,
std::int64_t n,
sycl::buffer<T,1> &x,
std::int64_t incx,
sycl::buffer<std::int64_t,1> &result)
}
Input Parameters
- queue
- The queue where the routine should be executed.
- n
- Number of elements in vectorx.
- x
- Buffer holding input vectorx. Size of the buffer must be at least (1 + (n- 1)*abs(incx)). See Matrix Storage for more details.
- incx
- Stride of vectorx.
Output Parameters
- result
- Buffer where the zero-based indexiof the minimum element is stored.
iamin (USM Version)
Syntax
namespace oneapi::mkl::blas::column_major {
sycl::event iamin(sycl::queue &queue,
std::int64_t n,
const T *x,
std::int64_t incx,
T_res *result,
const std::vector<sycl::event> &dependencies = {})
}
namespace oneapi::mkl::blas::row_major {
sycl::event iamin(sycl::queue &queue,
std::int64_t n,
const T *x,
std::int64_t incx,
T_res *result,
const std::vector<sycl::event> &dependencies = {})
}
Input Parameters
- queue
- The queue where the routine should be executed.
- n
- Number of elements in vectorx.
- x
- The pointer to input vectorx. Size of the array holding input vectorxmust be at least (1 + (n- 1)*abs(incx)). See Matrix Storage for more details.
- incx
- Stride of vectorx.
Output Parameters
- result
- Pointer to where the zero-based indexiof the minimum element is stored.
Return Values
Output event to wait on to ensure computation is complete.