I want to create this matrix.
$H=\begin{bmatrix}
0 & 0 & 0 & 0 & \ldots & 0 & \ldots\ldots & 1 & 1 & 1 &\ldots & 1\\
0 & 0 & 0 & 0 & \ldots & 0 & \ldots\ldots & 1 & 1 & 1 &\ldots & \alpha_{q-1}\\
\vdots & \vdots & \vdots & \vdots & xxxxx & \vdots & xxxxxxx & \vdots & \vdots & \vdots & xxxxxx & \vdots\\
0 & 1 & 1 & 1 & \ldots & 1 & \ldots\ldots & 0 & 0 & 0 &\ldots & \alpha_{q-1}\\
1 & 0 & 1 & \alpha_2 & \ldots & \alpha_{q-1} & \ldots\ldots & 0 & 1 & \alpha_2 &\ldots & \alpha_{q-1}
\end{bmatrix}$
I get this error
Underfull \hbox (badness 10000) in paragraph at lines 318--330
Underfull \hbox (badness 10000) in paragraph at lines 340--342
! Extra alignment tab has been changed to \cr.
<recently read> \endtemplate
l.344 ...& \ldots & 0 & \ldots\ldots & 1 & 1 & 1 &
\ldots & 1\\
?
1 Answer
By default, the maximal number of columns in a matrix of amsmath is 10. But you can change that:
\setcounter{MaxMatrixCols}{12}
