sum

Sum elements in an array. More...

Modules
	sum
	The C++ interface for sum.
	af_sum
	the C interface for sum

Detailed Description

Sum elements in an array.

Sum is a reduction operation that computes the arithmetic
sum of the elements in an array.

The first sum function sums elements along a specific dimension
of the array. The defualt dimension is the first non-singleton
dimension.

array a = constant(1,5,5);
//a = 1 1 1 1 1
//  = 1 1 1 1 1
//  = 1 1 1 1 1
//  = 1 1 1 1 1
//  = 1 1 1 1 1

b = sum(a); //b = [5]
            //    [5]
            //    [5]
            //    [5]
            //    [5]

The second form of sum is templated, and returns the sum of all array elements to the host.

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