asum¶
Purpose¶
Computes the sum across one dimension of an N-dimensional array.
Format¶
-
y =
asum(x, dim)¶ - Parameters:
x (N-dimensional array) –
dim (scalar) – the dimension across which to sum.
- Returns:
y (N-dimensional array) –
Examples¶
x = seqa(1, 1, 24);
dims = { 2, 3, 4 };
x = areshape(x, dims);
y = asum(x, 3);
x is a 2x3x4 array, such that:
Plane [1,.,.]
1.000 2.000 3.000 4.000
5.000 6.000 7.000 8.000
9.000 10.000 11.000 12.000
Plane [2,.,.]
13.000 14.000 15.000 16.000
17.000 18.000 19.000 20.000
21.000 22.000 23.000 24.000
and y is equal to:
Plane [1,.,.]
14.000 16.000 18.000 20.000
22.000 24.000 26.000 28.000
30.000 32.000 34.000 36.000
y = asum(x,1);
Using the same array x as the above example, this example computes the sum across the first dimension. y will be a 2x3x1 array, such that:
Plane [1,.,.]
10.000
26.000
42.000
Plane [2,.,.]
58.000
74.000
90.000
Remarks¶
The output y, will have the same sizes of dimensions as x, except that the dimension indicated by dim will be collapsed to 1.
See also
Functions amean()