**Matrices**

You must always use the `amsmath`

package if you are going to use the following commands. There are four main types of matrix, as shown in the code below:

```
\begin{matrix}
a & b \\
c & d
\end{matrix}
\quad
\begin{pmatrix}
a & b \\
c & d
\end{pmatrix}
\quad
\begin{bmatrix}
a & b \\
c & d
\end{bmatrix}
\quad
\begin{vmatrix}
a & b \\
c & d
\end{vmatrix}
\quad
\begin{Vmatrix}
a & b \\
c & d
\end{Vmatrix}
```

This code produces

There are a couple important things to note about this:

- It is important you put your matrix within the
`equation`

,`equation*`

, or`$...$`

environment - the`bmatrix`

command is not a math environment on its own. - The construction of the matrix is actually fairly simple. For each row, you create each element (say
`x_{11}`

), then put a`&`

, and then write the next element. For multiple rows, at the end of each row put`\\`

(you do not have to do this for the last row). It is fairly similar to a table in this.