amean

Purpose

Computes the mean across one dimension of an N-dimensional array.

Format

y = amean(x, dim)

Parameters:

• x (N-dimensional array.)

• dim (Scalar) – The dimension across which to compute the mean.

Returns:

y ([N-1]-dimensional array)

Examples

// Create an additive sequence from 1-24
x = seqa(1, 1, 24);

// 'Reshape' this 24x1 vector into a 2x3x4 dimensional array
x = areshape(x, 2|3|4);

y = amean(x, 3);

x is a 2x3x4 array, such that: [1,1,1] through [1,3,4] =

1.0000000       2.0000000       3.0000000       4.0000000
5.0000000       6.0000000       7.0000000       8.0000000
9.0000000       10.000000       11.000000       12.000000

[2,1,1] through [2,3,4] =

13.000000       14.000000       15.000000       16.000000
17.000000       18.000000       19.000000       20.000000
21.000000       22.000000       23.000000       24.000000

y will be a 1x3x4 array, such that: [1,1,1] through [1,3,4] =

7.0000000       8.0000000       9.0000000       10.000000
11.000000       12.000000       13.000000       14.000000
15.000000       16.000000       17.000000       18.000000

y = amean(x, 1);

Using the same array x as the above example, this example computes the mean across the first dimension. y will be a 2x3x1 array, such that: [1,1,1] through [1,3,1] =

2.5000000
6.5000000
10.500000

[2,1,1] through [2,3,1] =

14.500000
18.500000
22.500000

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 asum()