iamin

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

Syntax

void iamin(queue &exec_queue, std::int64_t n, buffer<T, 1> &x, std::int64_t incx, buffer<std::int64_t, 1> &result)

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

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.

incx

Stride of vector x.

Output Parameters

result

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