iamax: Find max element

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

Functions
magma_int_t	magma_icamax_batched (magma_int_t length, magmaFloatComplex **x_array, magma_int_t xi, magma_int_t xj, magma_int_t lda, magma_int_t incx, magma_int_t **ipiv_array, magma_int_t ipiv_i, magma_int_t step, magma_int_t gbstep, magma_int_t *info_array, magma_int_t batchCount, magma_queue_t queue)
	ICAMAX find the index of max absolute value of elements in x and store the index in ipiv.
magma_int_t	magma_idamax_batched (magma_int_t length, double **x_array, magma_int_t xi, magma_int_t xj, magma_int_t lda, magma_int_t incx, magma_int_t **ipiv_array, magma_int_t ipiv_i, magma_int_t step, magma_int_t gbstep, magma_int_t *info_array, magma_int_t batchCount, magma_queue_t queue)
	IDAMAX find the index of max absolute value of elements in x and store the index in ipiv.
magma_int_t	magma_isamax_batched (magma_int_t length, float **x_array, magma_int_t xi, magma_int_t xj, magma_int_t lda, magma_int_t incx, magma_int_t **ipiv_array, magma_int_t ipiv_i, magma_int_t step, magma_int_t gbstep, magma_int_t *info_array, magma_int_t batchCount, magma_queue_t queue)
	ISAMAX find the index of max absolute value of elements in x and store the index in ipiv.
magma_int_t	magma_izamax_batched (magma_int_t length, magmaDoubleComplex **x_array, magma_int_t xi, magma_int_t xj, magma_int_t lda, magma_int_t incx, magma_int_t **ipiv_array, magma_int_t ipiv_i, magma_int_t step, magma_int_t gbstep, magma_int_t *info_array, magma_int_t batchCount, magma_queue_t queue)
	IZAMAX find the index of max absolute value of elements in x and store the index in ipiv.

Detailed Description

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

Function Documentation

magma_icamax_batched()

magma_int_t magma_icamax_batched	(	magma_int_t	length,
		magmaFloatComplex **	x_array,
		magma_int_t	xi,
		magma_int_t	xj,
		magma_int_t	lda,
		magma_int_t	incx,
		magma_int_t **	ipiv_array,
		magma_int_t	ipiv_i,
		magma_int_t	step,
		magma_int_t	gbstep,
		magma_int_t *	info_array,
		magma_int_t	batchCount,
		magma_queue_t	queue )

ICAMAX find the index of max absolute value of elements in x and store the index in ipiv.

This is an internal routine that might have many assumption.

Parameters

[in]	length	INTEGER On entry, length specifies the size of vector x. length >= 0.
[in]	x_array	Array of pointers, dimension (batchCount). Each is a COMPLEX array of dimension
[in]	xi	INTEGER Row offset, internal use
[in]	xj	INTEGER Column offset, internal use
[in]	incx	Specifies the increment for the elements of X. INCX must not be zero.
[in]	step	INTEGER the offset of ipiv
[in]	lda	INTEGER The leading dimension of each array A, internal use to find the starting position of x.
[out]	ipiv_array	Array of pointers, dimension (batchCount), for corresponding matrices. Each is an INTEGER array, dimension (min(M,N)) The pivot indices; for 1 <= i <= min(M,N), row i of the matrix was interchanged with row IPIV(i).
[out]	info_array	Array of INTEGERs, dimension (batchCount), for corresponding matrices. = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value or another error occured, such as memory allocation failed. > 0: if INFO = i, U(i,i) is exactly zero. The factorization has been completed, but the factor U is exactly singular, and division by zero will occur if it is used to solve a system of equations.
[in]	gbstep	INTEGER the offset of info, internal use
[in]	batchCount	INTEGER The number of matrices to operate on.
[in]	queue	magma_queue_t Queue to execute in.

magma_idamax_batched()

magma_int_t magma_idamax_batched	(	magma_int_t	length,
		double **	x_array,
		magma_int_t	xi,
		magma_int_t	xj,
		magma_int_t	lda,
		magma_int_t	incx,
		magma_int_t **	ipiv_array,
		magma_int_t	ipiv_i,
		magma_int_t	step,
		magma_int_t	gbstep,
		magma_int_t *	info_array,
		magma_int_t	batchCount,
		magma_queue_t	queue )

IDAMAX find the index of max absolute value of elements in x and store the index in ipiv.

This is an internal routine that might have many assumption.

Parameters

[in]	length	INTEGER On entry, length specifies the size of vector x. length >= 0.
[in]	x_array	Array of pointers, dimension (batchCount). Each is a DOUBLE PRECISION array of dimension
[in]	xi	INTEGER Row offset, internal use
[in]	xj	INTEGER Column offset, internal use
[in]	incx	Specifies the increment for the elements of X. INCX must not be zero.
[in]	step	INTEGER the offset of ipiv
[in]	lda	INTEGER The leading dimension of each array A, internal use to find the starting position of x.
[out]	ipiv_array	Array of pointers, dimension (batchCount), for corresponding matrices. Each is an INTEGER array, dimension (min(M,N)) The pivot indices; for 1 <= i <= min(M,N), row i of the matrix was interchanged with row IPIV(i).
[out]	info_array	Array of INTEGERs, dimension (batchCount), for corresponding matrices. = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value or another error occured, such as memory allocation failed. > 0: if INFO = i, U(i,i) is exactly zero. The factorization has been completed, but the factor U is exactly singular, and division by zero will occur if it is used to solve a system of equations.
[in]	gbstep	INTEGER the offset of info, internal use
[in]	batchCount	INTEGER The number of matrices to operate on.
[in]	queue	magma_queue_t Queue to execute in.

magma_isamax_batched()

magma_int_t magma_isamax_batched	(	magma_int_t	length,
		float **	x_array,
		magma_int_t	xi,
		magma_int_t	xj,
		magma_int_t	lda,
		magma_int_t	incx,
		magma_int_t **	ipiv_array,
		magma_int_t	ipiv_i,
		magma_int_t	step,
		magma_int_t	gbstep,
		magma_int_t *	info_array,
		magma_int_t	batchCount,
		magma_queue_t	queue )

ISAMAX find the index of max absolute value of elements in x and store the index in ipiv.

This is an internal routine that might have many assumption.

Parameters

[in]	length	INTEGER On entry, length specifies the size of vector x. length >= 0.
[in]	x_array	Array of pointers, dimension (batchCount). Each is a REAL array of dimension
[in]	xi	INTEGER Row offset, internal use
[in]	xj	INTEGER Column offset, internal use
[in]	incx	Specifies the increment for the elements of X. INCX must not be zero.
[in]	step	INTEGER the offset of ipiv
[in]	lda	INTEGER The leading dimension of each array A, internal use to find the starting position of x.
[out]	ipiv_array	Array of pointers, dimension (batchCount), for corresponding matrices. Each is an INTEGER array, dimension (min(M,N)) The pivot indices; for 1 <= i <= min(M,N), row i of the matrix was interchanged with row IPIV(i).
[out]	info_array	Array of INTEGERs, dimension (batchCount), for corresponding matrices. = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value or another error occured, such as memory allocation failed. > 0: if INFO = i, U(i,i) is exactly zero. The factorization has been completed, but the factor U is exactly singular, and division by zero will occur if it is used to solve a system of equations.
[in]	gbstep	INTEGER the offset of info, internal use
[in]	batchCount	INTEGER The number of matrices to operate on.
[in]	queue	magma_queue_t Queue to execute in.

magma_izamax_batched()

magma_int_t magma_izamax_batched	(	magma_int_t	length,
		magmaDoubleComplex **	x_array,
		magma_int_t	xi,
		magma_int_t	xj,
		magma_int_t	lda,
		magma_int_t	incx,
		magma_int_t **	ipiv_array,
		magma_int_t	ipiv_i,
		magma_int_t	step,
		magma_int_t	gbstep,
		magma_int_t *	info_array,
		magma_int_t	batchCount,
		magma_queue_t	queue )

IZAMAX find the index of max absolute value of elements in x and store the index in ipiv.

This is an internal routine that might have many assumption.

Parameters

[in]	length	INTEGER On entry, length specifies the size of vector x. length >= 0.
[in]	x_array	Array of pointers, dimension (batchCount). Each is a COMPLEX_16 array of dimension
[in]	xi	INTEGER Row offset, internal use
[in]	xj	INTEGER Column offset, internal use
[in]	incx	Specifies the increment for the elements of X. INCX must not be zero.
[in]	step	INTEGER the offset of ipiv
[in]	lda	INTEGER The leading dimension of each array A, internal use to find the starting position of x.
[out]	ipiv_array	Array of pointers, dimension (batchCount), for corresponding matrices. Each is an INTEGER array, dimension (min(M,N)) The pivot indices; for 1 <= i <= min(M,N), row i of the matrix was interchanged with row IPIV(i).
[out]	info_array	Array of INTEGERs, dimension (batchCount), for corresponding matrices. = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value or another error occured, such as memory allocation failed. > 0: if INFO = i, U(i,i) is exactly zero. The factorization has been completed, but the factor U is exactly singular, and division by zero will occur if it is used to solve a system of equations.
[in]	gbstep	INTEGER the offset of info, internal use
[in]	batchCount	INTEGER The number of matrices to operate on.
[in]	queue	magma_queue_t Queue to execute in.