iamax: Find max element

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

Functions
magma_int_t	magma_icamax (magma_int_t n, magmaFloatComplex_const_ptr dx, magma_int_t incx, magma_queue_t queue)
magma_int_t	magma_idamax (magma_int_t n, magmaDouble_const_ptr dx, magma_int_t incx, magma_queue_t queue)
magma_int_t	magma_isamax (magma_int_t n, magmaFloat_const_ptr dx, magma_int_t incx, magma_queue_t queue)
magma_int_t	magma_izamax (magma_int_t n, magmaDoubleComplex_const_ptr dx, magma_int_t incx, magma_queue_t queue)

Detailed Description

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

Function Documentation

magma_icamax()

magma_int_t magma_icamax	(	magma_int_t	n,
		magmaFloatComplex_const_ptr	dx,
		magma_int_t	incx,
		magma_queue_t	queue )

Returns

Index of element of vector x having max. absolute value; \( \text{argmax}_i\; | real(x_i) | + | imag(x_i) | \).

Parameters

[in]	n	Number of elements in vector x. n >= 0.
[in]	dx	COMPLEX array on GPU device. The n element vector x of dimension (1 + (n-1)*incx).
[in]	incx	Stride between consecutive elements of dx. incx > 0.
[in]	queue	magma_queue_t Queue to execute in.

magma_idamax()

magma_int_t magma_idamax	(	magma_int_t	n,
		magmaDouble_const_ptr	dx,
		magma_int_t	incx,
		magma_queue_t	queue )

Returns

Index of element of vector x having max. absolute value; \( \text{argmax}_i\; | real(x_i) | + | imag(x_i) | \).

Parameters

[in]	n	Number of elements in vector x. n >= 0.
[in]	dx	DOUBLE PRECISION array on GPU device. The n element vector x of dimension (1 + (n-1)*incx).
[in]	incx	Stride between consecutive elements of dx. incx > 0.
[in]	queue	magma_queue_t Queue to execute in.

magma_isamax()

magma_int_t magma_isamax	(	magma_int_t	n,
		magmaFloat_const_ptr	dx,
		magma_int_t	incx,
		magma_queue_t	queue )

Returns

Index of element of vector x having max. absolute value; \( \text{argmax}_i\; | real(x_i) | + | imag(x_i) | \).

Parameters

[in]	n	Number of elements in vector x. n >= 0.
[in]	dx	REAL array on GPU device. The n element vector x of dimension (1 + (n-1)*incx).
[in]	incx	Stride between consecutive elements of dx. incx > 0.
[in]	queue	magma_queue_t Queue to execute in.

magma_izamax()

magma_int_t magma_izamax	(	magma_int_t	n,
		magmaDoubleComplex_const_ptr	dx,
		magma_int_t	incx,
		magma_queue_t	queue )

Returns

Index of element of vector x having max. absolute value; \( \text{argmax}_i\; | real(x_i) | + | imag(x_i) | \).

Parameters

[in]	n	Number of elements in vector x. n >= 0.
[in]	dx	COMPLEX_16 array on GPU device. The n element vector x of dimension (1 + (n-1)*incx).
[in]	incx	Stride between consecutive elements of dx. incx > 0.
[in]	queue	magma_queue_t Queue to execute in.