## Vector Scaling

Vector scaling is the process of multiplying each value in the vector by some amount (hence "scalar").

$2 \begin{bmatrix} u_1 \\ u_2 \end{bmatrix} = \begin{bmatrix} 2 * u_1 \\ 2 * u_2 \end{bmatrix}$

The amount you scale the vector is often referred to as the [[Scalar]].

It can be visualised as growing or shrinking the arrow that represents the vector (see cover image).

In Perl, variables that contain a single value are called scalar variables.