How to start the line number at specific line or skip a line in algorithm2e?

Question

I trying to customize the line number of my algorithm with the algorithm2e package. I want to start the line number at a specific line or just a given line. I am using the following code example:

\documentclass{article}
\usepackage[linesnumbered,ruled,vlined]{algorithm2e}
\begin{document}
\begin{algorithm}[!ht]
\caption{Overlapped Co-Clustering}
\DontPrintSemicolon
\SetNoFillComment
\footnotesize
\SetKwInOut{Input}{Input}
\SetKwInOut{Output}{Output}
\SetKwFunction{OCoClus}{OCoClus}
\Input{Input dataset D, Max number of co-clusters K \textit{{optional}}, Max object noise threshold $\epsilon_I$ \textit{{optional}}, Max attribute noise threshold $\epsilon_J$ \textit{{optional}}}
\Output{Set of disjoint and overlapped co-clusters $\Phi$}
\OCoClus{D,K,$\epsilon_I$,$\epsilon_J$};
$\prod \leftarrow \emptyset$;
$D_{r} \leftarrow D$ \textit{{residual matrix}}
\end{algorithm}
\end{document}

It generates the following output:

I want that the second line (line number 2) starts with 1 and the first line (line number 1) is not numbered. I did not found a way to do this.

Hi @Enevevet. I saw this answer, but it does not work for me. Because of that, I asked it. Tkx — Yuri Santos, Aug 14 '21 at 23:40

score 1 · Accepted Answer · answered Aug 13 '21 at 23:16

The following code introduces \nlnonumber that removes the functionality of \nl - the line numbering mechanism - just for that line. Place it at the start of the line.

\documentclass{article}
\usepackage[linesnumbered,ruled]{algorithm2e}
\SetKwInOut{Input}{Input}
\SetKwInOut{Output}{Output}
\SetKwFunction{OCoClus}{OCoClus}
\DontPrintSemicolon
\SetNoFillComment
\let\oldnl\nl
\newcommand{\nlnonumber}{\renewcommand{\nl}{\let\nl\oldnl}}
\begin{document}
\begin{algorithm}
  \caption{Overlapped Co-Clustering}
\Input{%
    Input dataset $D$, 
    Max number of co-clusters $K$ \textit{{optional}}, 
    Max object noise threshold $\epsilon_I$ \textit{{optional}}, 
    Max attribute noise threshold $\epsilon_J$ \textit{{optional}}}
  \Output{Set of disjoint and overlapped co-clusters $\Phi$}
\nlnonumber
  \OCoClus{$D$, $K$, $\epsilon_I$, $\epsilon_J$};
  $\prod \leftarrow \emptyset$;
  $D_r \leftarrow D$ \textit{{residual matrix}}
\end{algorithm}
\end{document}

Tkx, Werner. Now it worked for me. I tried your previous answer that the Enevevet pointed out, but it does not work for me. I did not recognize why, however, this answer works for me. Tkx. — Yuri Santos, Aug 14 '21 at 23:45

How to start the line number at specific line or skip a line in algorithm2e?

1 Answers1