# Having trouble regarding matrix

How can I draw this matrix? since I’m new to LateX, it is very hard for me.

## 1 Answer

There are several environments for writing matrices with the amsmath package, including

• matrix for no delimiters
• pmatrix for parentheses as delimiters
• bmatrix for (square) brackets as delimiters
• Bmatrix for (curly) braces as delimiters
• vmatrix for | as delimiters
• Vmatrix for || as delimiters

Each of these environments has a starred variant that allows you to specify the alignment of entries in a column as an optional argument to the environment.

Once you've determined which matrix environment you want to use, you can then specify each row of your matrix, using ampersands to separate entries in a row and using double backslashes to separate rows. This method of separating entries and rows is the same method used when writing tables in the tabular environment and similar.

This minimal working example should render your specific matrix as you need:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
$R = \begin{bmatrix} r_{11} & - & \ldots & \ldots & - \\ r_{21} & r_{22} & \ldots & \ldots & r_{2N} \\ \vdots & \vdots & \ldots & \ddots & \vdots \\ - & - & \ldots & \ldots & r_{MN} \end{bmatrix}$

\end{document}

• Thank you very much for the information and the example!
– user189304
May 21 '19 at 2:51
• @Delan No problem! Much of this information can also be found over in the Wikibooks page for mathematics in LaTeX, and it provides a few examples too. May 21 '19 at 2:55