How To Use More Than 10 Columns in Matrix
Less than 1 minuteAbout 115 words
\begin{bmatrix}
v_1 & 1 & 1 & 1 & & & & & & & \\
v_2 & -1 & & & 1 & 1 & & & -1 & & \\
v_3 & & & & -1 & & 1 & -1 & & -1 & \\
v_4 & & -1 & & & & -1 & 1 & & & -1 \\
v_5 & & & -1 & & -1 & & & 1 & 1 & 1 \\
\end{bmatrix}
Problem
Extra alignment tab has been changed to \cr.
<recently read> \endtemplate
Solution[1]
\setcounter{MaxMatrixCols}{20} % enables you to use 20 columns
\begin{bmatrix}
v_1 & 1 & 1 & 1 & & & & & & & \\
v_2 & -1 & & & 1 & 1 & & & -1 & & \\
v_3 & & & & -1 & & 1 & -1 & & -1 & \\
v_4 & & -1 & & & & -1 & 1 & & & -1 \\
v_5 & & & -1 & & -1 & & & 1 & 1 & 1 \\
\end{bmatrix}