3.1. Vector

Vector

For $n$ elements $x_1,x_2,...,x_n$ the ordered list,
$\vec{x}=\left[\begin{array}{c}{x}_1\\ x_2\\ ⋮\\ x_n\end{array}\right],$
is a column vector $\vec{x}\in {\mathbb{R}}^n$ with size $n$ and transpose row vector
${\vec{x}}^T=\left[\begin{array}{cccc}{x}_1& x_2& \dots & x_n\end{array}\right],$
where $\vec{x}\ne {\vec{x}}^T$.