# How to write a matrix norm?

I want to write a matrix but instead of brackets, I want it to be a norm. How do I do this? So instead of [] in a normal matrix, I want || ||.

• \left\|\begin{matrix}...\end{matrix}\right\| – David Carlisle May 3 '17 at 21:34
• "[] in a normal matrix" How are you doing that? There's several ways. – Teepeemm May 3 '17 at 21:34
• @David Carlisle thanks that worked sorry I didnt think it was so simply – daultongray8 May 3 '17 at 21:41
• You have the Vmatrix environment! – Bernard May 3 '17 at 21:46

You can choose among many different matrix enviornments in LaTeX. Here are your choices:

\documentclass{article}
\usepackage{amsmath}
\usepackage{multicol}
\begin{document}
\centering
\begin{multicols}{3}
matrix  $\begin{matrix} a & b \\ c & d \\ \end{matrix}$

pmatrix $\begin{pmatrix} a & b \\ c & d \\ \end{pmatrix}$

bmatrix $\begin{bmatrix} a & b \\ c & d \\ \end{bmatrix}$

Bmatrix $\begin{Bmatrix} a & b \\ c & d \\ \end{Bmatrix}$

vmatrix $\begin{vmatrix} a & b \\ c & d \\ \end{vmatrix}$

Vmatrix $\begin{Vmatrix} a & b \\ c & d \\ \end{Vmatrix}$
\end{multicols}
\end{document} 