Sum and product

array	sum (const array &input, int dim=-1)
	sum of the elements along a dimension in matrix
template<typename ty >
ty	sum (const array &input)
	summation of all elements in array
array	prod (const array &input, int dim=-1)
	product (multiplication) of elements along a dimension in matrix
template<typename ty >
ty	prod (const array &input)
	product (multiplication) of all elements in array

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Function Documentation

array af::sum	(	const array &	input,
		int	dim = -1
	)

sum of the elements along a dimension in matrix

Parameters:

[in]	input
[in]	dim	dimension along which to operate (-1 indicates first nonsingleton dimension)

Returns:

array with values summed along the dimension dim in the input

Examples:

examples/misc/gfor.cpp, and examples/misc/integer.cpp.

ty af::sum

(

const array &

input

)

summation of all elements in array

       float hx[] = { -3, -5, 2, -9 };
       array x1(hx, 2,2); // 2x2 matrix
       array x2(hx, 4,1); // 4x1 vector
       printf("%g,%g\n", sum<float>(x1), sum<float>(x2)); // -15,-15

Parameters:

[in]

input

Returns:

sum of all values in the input array

array af::prod	(	const array &	input,
		int	dim = -1
	)

product (multiplication) of elements along a dimension in matrix

Parameters:

[in]	input
[in]	dim	dimension along which to operate (-1 indicates first nonsingleton dimension)

Returns:

array with values multiplied along the dimension dim in the input

Examples:

examples/misc/integer.cpp.

ty af::prod

(

const array &

input

)

product (multiplication) of all elements in array

       float hx[] = { -3, -5, 2, -9 };
       array x1(hx, 2,2); // 2x2 matrix
       array x2(hx, 4,1); // 4x1 vector
       printf("%g,%g\n", prod<float>(x1), prod<float>(x2)); // -270,-270

Parameters:

[in]

input

Returns:

product of all values in the input array