customize tabular

Question

i want to customize my table using the tabular environments, i write :

\begin{tabular}{|l|c|r|}
 \hline
 colonne 1 & colonne 2 & colonne 3 \\
 \hline
 1.1 & 1.2 & 1.3 \\
 \hline
 2.1 & 2.2 & 2.3 \\
 \hline
\end{tabular} 

i want to delete some line , something like the picture below

Answer 1

You can achieve what you want using a combination of \cline and \multicolumn as demonstrated below

\documentclass{article}

\begin{document}

\begin{tabular}{|l|c|r|}
 \cline{2-3}
 \multicolumn{1}{l|}{colonne 1} & colonne 2 & colonne 3 \\
 \hline
 1.1 & 1.2 & 1.3 \\
 \hline
 2.1 & 2.2 & 2.3 \\
 \hline
\end{tabular} 

\end{document}

As a side note, have a look at the booktabs documentation for reasons not to use vertical rules in table.