var

Syntax

v = var(x)

v = var(x,scale)

v = var(x,scale,dim)

Inputs

x

Data sample.

Type: double

Dimension: vector | matrix

scale

Scale option.

Type: integer

Use scale=0 (default) to divide by n-1, and scale=1 to divide by n, where n is the number of samples in each data vector.

Dimension: integer

dim

Dimension on which to perform the calculation.

Default: first non-singleton dimension.

Type: integer

Dimension: scalar

Outputs

v

Variance.

Dimension: scalar | matrix

Example 1

Vector example.

x=[9.3, 10.6, 11.9, 13.3, 15.1, 18.2];
v=var(x)

v = 10.435

Example 2

Matrix example.

x=[9.3, 4.8; 10.6, 6.6; 11.9, 8.0; 13.3, 9.3; 15.1, 10.6; 18.2, 11.9];
v=var(x)

v = [Matrix] 1 x 2
10.435 6.8307

Comments

var (x) = SUM(x(i) - mean(x))^2 / (n-1)

This is the definition for scale = 0.