iamax: Find max element

\(\text{argmax}_i\; |x_i|\) More...

Functions
template<typename T >
int64_t	blas::iamax (int64_t n, T const *x, int64_t incx)
int64_t	blas::iamax (int64_t n, float const *x, int64_t incx)
	CPU, float version.
int64_t	blas::iamax (int64_t n, double const *x, int64_t incx)
	CPU, double version.
int64_t	blas::iamax (int64_t n, std::complex< float > const *x, int64_t incx)
	CPU, complex<float> version.
int64_t	blas::iamax (int64_t n, std::complex< double > const *x, int64_t incx)
	CPU, complex<double> version.

Detailed Description

\(\text{argmax}_i\; |x_i|\)

Function Documentation

iamax()

template<typename T >

int64_t blas::iamax	(	int64_t	n,
		T const *	x,
		int64_t	incx
	)

Returns

Index of infinity-norm of vector, \(|| x ||_{inf}\), \(\text{argmax}_{i=0}^{n-1} |Re(x_i)| + |Im(x_i)|\). Returns -1 if n = 0.

Generic implementation for arbitrary data types.

Parameters

[in]	n	Number of elements in x. n >= 0.
[in]	x	The n-element vector x, in an array of length (n-1)*incx + 1.
[in]	incx	Stride between elements of x. incx > 0.