[Tex/LaTex] Algorithm2e modify line numbers

algorithm2eformattingline-numbering

I'm using the LaTeX algorithm2e package by defining

\usepackage[ruled, linesnumbered, vlined]{algorithm2e}

The linesnumbered argument adds lines numbers from [1,…,n] if we have an algorithm with n lines.
I would like to know if there's any possibility to change the numbers in something like: [1*,…,n*] (adding a symbol like a * or a ' behind the number).
Note I have several algorithms in my document, thus I want to define the above described "different line number style" in a local \begin{algorithm} ... \end{algorithm} scope.
I am thankful for all help and information.

Best Answer

Use the command \SetNlSty to change the style of the numbering. It takes three argumnts, the first is the font to use, the second the text to appear before the number and the third the text to appear after. Thus

\SetNlSty{textbf}{}{*}

will place * after the line numbers, all bold face (which is the default font).

Sample output

\documentclass{article}

\usepackage[ruled,linesnumbered,vlined]{algorithm2e}

\begin{document}

\begin{algorithm}
  \eIf {\( x>y \)}{greater}{less than or equal}
\end{algorithm}

\SetNlSty{textbf}{}{*}

\begin{algorithm}
  \eIf {\( x>y \)}{greater}{less than or equal}
\end{algorithm}

\end{document}

Related Solutions

[Tex/LaTex] How to adjust line numbers of algorithm2e package

The simplest way to do this is to use the formatting commands \Indm and \Indp to decrease and increase the indentation. Used around the input/output commands makes these lines flushleft, just like the subsequent line numbers. The example below shows this in action in a cut-down version of the second example from the manual.

Sample output

\documentclass{article}

\usepackage[linesnumbered]{algorithm2e}

\begin{document}

\IncMargin{1em}
\begin{algorithm}
  \SetKwData{Left}{left}
  \SetKwData{Up}{up}
  \SetKwFunction{FindCompress}{FindCompress}
  \SetKwInOut{Input}{input}
  \SetKwInOut{Output}{output}

\Indm  
  \Input{A bitmap $Im$ of size $w\times l$}
  \Output{A partition of the bitmap}
\Indp
  \BlankLine
  \For{$i\leftarrow 2$ \KwTo $l$}{ 
    \Left$\leftarrow$ \FindCompress{$Im[i,j-1]$}\;
    \Up$\leftarrow$ \FindCompress{$Im[i-1,]$}\; }
    \lForEach{element $e$ of the line $i$}{\FindCompress{p}}
\end{algorithm}
\DecMargin{1em}

\end{document}

For more general indentation changes there is \Indentp, which is defined in the style class, but not mentioned in the manual. \Indm is equivalent to \Indentp{-1em}, \Indp is \Indentp{1em}. There is also \Indmm and \Indpp which adjust the indentation by 0.5em. You need an extra 0.5em for each extra digit of line number. In particular, if you have two digit line numbers you can use \Indm\Indmm as follows:

Sample two digit output

\documentclass{article}

\usepackage[linesnumbered]{algorithm2e}

\begin{document}

\IncMargin{1.5em}
\begin{algorithm}
  \SetKwData{Left}{left}
  \SetKwData{Up}{up}
  \SetKwFunction{FindCompress}{FindCompress}
  \SetKwInOut{Input}{input}
  \SetKwInOut{Output}{output}

\Indm\Indmm
  \Input{A bitmap $Im$ of size $w\times l$}
  \Output{A partition of the bitmap}
\Indp\Indpp
  \BlankLine
  \For{$i\leftarrow 2$ \KwTo $l$}{ 
    \Left$\leftarrow$ \FindCompress{$Im[i,j-1]$}\;
    \Up$\leftarrow$ \FindCompress{$Im[i-1,]$}\; }
    \lForEach{element $e$ of the line $i$}{\FindCompress{p}}
  \For{$i\leftarrow 2$ \KwTo $l$}{ 
    \Left$\leftarrow$ \FindCompress{$Im[i,j-1]$}\;
    \Up$\leftarrow$ \FindCompress{$Im[i-1,]$}\; }
    \lForEach{element $e$ of the line $i$}{\FindCompress{p}}
  \For{$i\leftarrow 2$ \KwTo $l$}{ 
    \Left$\leftarrow$ \FindCompress{$Im[i,j-1]$}\;
    \Up$\leftarrow$ \FindCompress{$Im[i-1,]$}\; }
    \lForEach{element $e$ of the line $i$}{\FindCompress{p}}
  \For{$i\leftarrow 2$ \KwTo $l$}{ 
    \Left$\leftarrow$ \FindCompress{$Im[i,j-1]$}\;
    \Up$\leftarrow$ \FindCompress{$Im[i-1,]$}\; }
    \lForEach{element $e$ of the line $i$}{\FindCompress{p}}
    \BlankLine
    \Indm\Indmm
  \Input{A bitmap $Im$ of size $w\times l$}
  \Output{A partition of the bitmap}
\Indp\Indpp
\end{algorithm}
\DecMargin{1.5em}

\end{document}

There is no internal variable storing the width of the line numbers. The package uses \llap to them in a box of width zero, with the numbers plus their space from the algorithm sticking out to the right of this box. As the examples in the documentation indicate, it is up to the user to adjust the margins to suit the given algorithm.

[Tex/LaTex] Turn off line numbering in algorithm2e

Depending on your use-case, you can either use \LinesNotNumbered or \LinesNumberedHidden to temporarily remove lines numbers in an algorithm. Under the latter, \ShowLn prints the line number for that specific line (if you wish to intermix showing/not):

enter image description here

\documentclass{book}
\usepackage[ruled,vlined,linesnumbered,resetcount,algochapter]{algorithm2e}% http://ctan.org/pkg/algorithm2e
\begin{document}

{\LinesNumberedHidden
\begin{algorithm}[ht]
  \centering
  nonumbering
  \caption{CAmple1}\label{algoCPOR1}
\end{algorithm}}

\begin{algorithm}[ht]
  \centering
  nonumbering
  \caption{CAmple2}\label{algoCPOR2}
\end{algorithm}

\LinesNumberedHidden
\begin{algorithm}[ht]
  \centering\ShowLn
  nonumbering
  \caption{CAmple3}\label{algoCPOR3}
\end{algorithm}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] How to adjust line numbers of algorithm2e package

[Tex/LaTex] Turn off line numbering in algorithm2e

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