# Remove border of top left table cell

I want to remove the border of the top left table cell (top-border and left border of this cell). My table looks like this:

\begin{table}[!ht]
\centering
\begin{tabular}{|c|c|c|c|}    \hline
&  Item1 & Item2 & Item3 \\ \hline
Group1 & 0.8 & 0.1 & 0.1 \\ \hline
Group2 & 0.1 & 0.8 & 0.1 \\ \hline
Group3 & 0.1 & 0.1 & 0.8 \\ \hline
Group4 & 0.34& 0.33& 0.33 \\ \hline
\end{tabular}
\end{table}


Does somebody have a hint how i can do this?

-

You need to use a column-specific line \cline as well as a \multicolumn{1}{c|} entry to remove the rules from the top left cell:

\documentclass{article}
\usepackage{booktabs}% http://ctan.org/pkg/booktabs
\begin{document}
\begin{table}[!ht]
\centering
\begin{tabular}{|c|c|c|c|}
\cline{2-4}
\multicolumn{1}{c|}{} & Item1 & Item2 & Item3 \\ \hline
Group1 & 0.8   & 0.1   & 0.1  \\ \hline
Group2 & 0.1   & 0.8   & 0.1  \\ \hline
Group3 & 0.1   & 0.1   & 0.8  \\ \hline
Group4 & 0.34  & 0.33  & 0.33 \\ \hline
\end{tabular}

\bigskip

\begin{tabular}{cccc}
\toprule
& Item1 & Item2 & Item3 \\ \midrule
Group1 & 0.8   & 0.1   & 0.1  \\
Group2 & 0.1   & 0.8   & 0.1  \\
Group3 & 0.1   & 0.1   & 0.8  \\
Group4 & 0.34  & 0.33  & 0.33 \\ \bottomrule
\end{tabular}
\end{table}
\end{document}​


I've also added a booktabs variant, which is still clear in terms of the presentation, and looks cleaner.

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+1 for booktabs in the battle against eye-anticandy – Brent.Longborough Jul 26 '12 at 21:07