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I am writing this matrix in my report:

  \begin{align}
  \mathbf{x}=
  \begin{pmatrix}
  1 & 1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 0 & 1 & 0 & 0 & 0 & 0\\
  1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 1 & 0 & 0 & 1 & 0 & 0 & 0\\
  1 & 1 & 0 & 1 & 1 & 0 & 1 & 1 & 0 & 0 & 1 & 0 & 0 & 1 & 0 & 0\\
  1 & 0 & 1 & 1 & 1 & 0 & 1 & 0 & 1 & 1 & 1 & 0 & 0 & 0 & 1 & 0
  \end{pmatrix}^\mathrm{T},
  \end{align}

I found errors pdfLatex> ! Extra alignment tab has been changed to \cr

Chiba
  • 449
  • 3
    This is very similar in nature to How to create a matrix with 20 columns in LaTeX. The solution is to increase the maximum number of columns to suit your needs (via the counter MaxMatrixCols). – Werner Jul 15 '14 at 22:01
  • @Werner Your link makes my answer look a little silly, even though my route was RTFM:) Probably should be marked as a duplicate and I shold delete my answer. –  Jul 15 '14 at 22:07
  • @Andrew: Although the question is a duplicate, it does not mean that your answer is silly or wrong. There is no need of deleting it really. –  Jul 15 '14 at 22:24

1 Answers1

4

From the amsldoc manual:

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

So you need:

\setcounter{MaxMatrixCols}{20}
\begin{align}
  \mathbf{x}=
  \begin{pmatrix}
  1 & 1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 0 & 1 & 0 & 0 & 0 & 0\\
  1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 1 & 0 & 0 & 1 & 0 & 0 & 0\\
  1 & 1 & 0 & 1 & 1 & 0 & 1 & 1 & 0 & 0 & 1 & 0 & 0 & 1 & 0 & 0\\
  1 & 0 & 1 & 1 & 1 & 0 & 1 & 0 & 1 & 1 & 1 & 0 & 0 & 0 & 1 & 0\\
  \end{pmatrix}^\mathrm{T},
\end{align}

(You seem to have only 16 columns, but gave you an extra 4 just in case:)