How to create a matrix with 20 columns in latex

Question

The code below works, but when I add 10 more columns, it does not. So, how can I add ten more columns to the matrix below?

\documentclass{article}
\usepackage{amsmath}
\begin{document}

\begin{equation}
\begin{bmatrix}
 1 & 0 & 0 & 0  & 0 & 1 & 0 & 0 & 1 & 0 
\end{bmatrix}
\end{equation}

\end{document}

Answer 1

One simple way is to use the array environment together the expansible brackets \left[ and \right] (note the use of {*{20}c} as suggested by @cmhughes):

\left[
\begin{array}{*{20}c}
 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 1 & 0 
\end{array}
\right]

The problem is the difference on the spacing for the brackets.

---

From the texdoc amsmath documentation:

The maximum number of columns in a matrix is determined by the counter MaxMatrixCols (normal value = 10), which you can change if necessary using \setcounter or \addtocounter commands.

So, you can just use

\setcounter{MaxMatrixCols}{20}
\begin{equation}
\begin{bmatrix}
 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 1 & 0 
\end{bmatrix}
\end{equation}

Answer 2

Instead of a bmatrix, you could use a +bmatrix from the tabularray package:

\documentclass{article}
\usepackage{amsmath}
\usepackage{tabularray}
\UseTblrLibrary{amsmath}
\begin{document}
\begin{equation}
\begin{+bmatrix}
 1 & 0 & 0 & 0  & 0 & 1 & 0 & 0 & 1 & 0 & 1 & 0 & 0 & 0  & 0 & 1 & 0 & 0 & 1 & 0 
\end{+bmatrix}
\end{equation}
\end{document}