iamin (USM Version)

Finds the index of the element with the smallest absolute value.

Syntax

event iamin(queue &exec_queue, std::int64_t n, const T *x, std::int64_t incx, T_res *result, const vector_class<event> &dependencies = {})

The USM version of iamin supports the following precisions and devices.

T

Devices Supported

float

Host, CPU, and GPU

double

Host, CPU, and GPU

std::complex<float>

Host, CPU, and GPU

std::complex<double>

Host, CPU, and GPU

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 maximal (complex variants).

Note

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.

Input Parameters

exec_queue

The queue where the routine should be executed.

n

Number of elements in vector x.

x

The 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.

incx

Stride of vector x.

Output Parameters

result

Pointer to where the zero-based index i of the minimum element will be stored.

Return Values

Output event to wait on to ensure computation is complete.

iamin nrm2