Cumulative and segmented sum

array	segsum (const array &input, const array &keys)
	Segmented sum.
array	accum (const array &input, int dim=-1, af_op_t op=SUM_T, bool isupcast=false)
	accumulated sum

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Function Documentation

array af::segsum	(	const array &	input,
		const array &	keys
	)

Segmented sum.

Parameters:

[in]	input	values to sum (treated as vector)
[in]	keys	The vector denoting segments

Returns:

Vector containing inclusive sums within each segment

array af::accum	(	const array &	input,
		int	dim = -1,
		af_op_t	op = SUM_T,
		bool	isupcast = false
	)

accumulated sum

Parameters:

[in]	input
[in]	dim	dimension along which to operate (-1 indicates first nonsingleton dimension)
[in]	op	accumulation type: SUM_T addition, PROD_T multiplication
[in]	isupcast	perform internal accumulation in double-precision if true (default false)

Returns:

cumulative (inclusive) sum along dimension

Examples:

examples/image/gfor_hist_demo.cpp, and examples/misc/blas.cpp.