General ⇒ latex table problem --about >{\centering}

[zhengyiqun08]

my code is as follows:
\begin{tabular}{|c |>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|}
[29-32, 34-36] & & \Checkmark & & & & &\Checkmark \\
\hline
\end{tabular}

the error indicated is "! Misplaced \noalign. \hline -> \noalign"

However, if I change this code to:
\begin{tabular}{|c |>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|}
[29-32, 34-36] & & \Checkmark & & & & &\\
\hline
\end{tabular}

or

\begin{tabular}{|c |>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|>{\centering}m{1.2 cm}|m{1.2 cm}|} %the last column without centering horizontally
[29-32, 34-36] & & \Checkmark & & & & &\Checkmark \\
\hline
\end{tabular}

No error occurs.

Can you help me fix it? Besides, why is there a ">" in this command ">{\centering}" ?

[gmedina]

Hi zhengyiqun08,

The array package redefines \\ (the command to change line). To avoid the error that you are getting there are two options:
1) Instead of \\ you can use \tabularnewline, as the following example suggests:

Code: Select all

\documentclass{article}
\usepackage{bbding}
\usepackage{array}

\begin{document}

\begin{tabular}{|c*{7}{|>{\centering}m{1.2 cm}}|}
  [29-32, 34-36] & & \Checkmark & & & & & \Checkmark \tabularnewline
  \hline
\end{tabular}

\end{document}

2) Use \arraybackslash just after \centering:

Code: Select all

\documentclass{article}
\usepackage{bbding}
\usepackage{array}

\begin{document}

\begin{tabular}{|c*{7}{|>{\centering\arraybackslash}m{1.2 cm}}|}
  [29-32, 34-36] & & \Checkmark & & & & & \Checkmark \\
  \hline
\end{tabular}

\end{document}

You can find the answer to the question about > in the array package documentation (page 2). There you will also find information about the shortcut that I used in the declaration of the table format.

[zhengyiqun08]

Thanks a lot, gmedina. Problem solved.