Section: Elementary Functions
y = sum(x,d)
where x is an n-dimensions array of numerical type.
The output is of the same numerical type as the input. The argument
d is optional, and denotes the dimension along which to take
the summation. The output y is the same size as x, except
that it is singular along the summation direction. So, for example,
if x is a 3 x 3 x 4 array, and we compute the summation along
dimension d=2, then the output is of size 3 x 1 x 4.
If d is omitted, then the summation is taken along the
first non-singleton dimension of x.
--> A = [5,1,3;3,2,1;0,3,1] A = <int32> - size: [3 3] Columns 1 to 3 5 1 3 3 2 1 0 3 1
We start by calling sum without a dimension argument, in which
case it defaults to the first nonsingular dimension (in this case,
along the columns or d = 1).
--> sum(A) ans = <int32> - size: [1 3] Columns 1 to 3 8 6 5
Next, we take the sum along the rows.
--> sum(A,2) ans = <int32> - size: [3 1] Columns 1 to 1 9 6 4