Algorithms – How to Make an Algorithm Environment Wider Than \linewidth or \textwidth?

algorithmswidth

I have already tried two things: \makebox[1.2\textwidth][c]{...} which did not work (perhaps missing \item). \redefinegeometry does not work well in this case beacause it’s not on a single page. MWE:

\documentclass[a4paper]{article}

\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{algorithm}
\usepackage[noend]{algpseudocode}

\begin{document}

\begin{algorithm}
\caption{Euclid’s algorithm}\label{alg:euclid}
\begin{algorithmic}[1]
\Procedure{Euclid}{$m,l$}\Comment{The g.c.d. of m and l}
\State $r\gets m\bmod l$
\While{$r\not=0$}\Comment{We have the answer if r is 0}
\State $m\gets l$
\State $l\gets r$
\State $r\gets m\bmod l$
\EndWhile\label{euclidendwhile}
\State \textbf{return} $l$\Comment{The gcd is l}
\EndProcedure
\end{algorithmic}
\end{algorithm}

\end{document}

Source: https://www.writelatex.com/examples/euclids-algorithm-an-example-of-how-to-write-algorithms-in-latex/mbysznrmktqf

Best Answer

You could make algorithm unfloatable and box it with another floatable environment which adapts the width.

In the following, an invisible tcolorbox is used for this purpose. Adapt the grow to left by and grow to right by options for the width needed. Also, the float settings are done by the float option.

\documentclass[a4paper]{article}

\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{algorithm}
\usepackage[noend]{algpseudocode}
\usepackage{lipsum}

\usepackage[skins]{tcolorbox}

\begin{document}

\lipsum[1]

\begin{tcolorbox}[blanker,float=tbp,
  grow to left by=1cm,grow to right by=1cm]
\begin{algorithm}[H]
\caption{Euclid's algorithm}\label{alg:euclid}
\begin{algorithmic}[1]
\Procedure{Euclid}{$m,l$}\Comment{The g.c.d. of m and l}
\State $r\gets m\bmod l$
\While{$r\not=0$}\Comment{We have the answer if r is 0}
\State $m\gets l$
\State $l\gets r$
\State $r\gets m\bmod l$
\EndWhile\label{euclidendwhile}
\State \textbf{return} $l$\Comment{The gcd is l}
\EndProcedure
\end{algorithmic}
\end{algorithm}
\end{tcolorbox}

\lipsum[1]

\end{document}

enter image description here

If there are many algorithm boxes to be adapted, you could use the following variant where an environment talgorithm is constructed. It takes a symmetric growth value as mandatory parameter and any tcolorbox option as optional parameter:

\documentclass[a4paper]{article}

\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{algorithm}
\usepackage[noend]{algpseudocode}
\usepackage{lipsum}

\usepackage[skins]{tcolorbox}

\newtcolorbox{talgorithm}[2][]{%
  blanker,float=tbp,grow to left by=#2,grow to right by=#2,
  before upper={\begin{algorithm}[H]},
  after upper={\end{algorithm}},
  #1
}

\begin{document}

\lipsum[1]

\begin{talgorithm}{1cm}
\caption{Euclid's algorithm}\label{alg:euclid}
\begin{algorithmic}[1]
\Procedure{Euclid}{$m,l$}\Comment{The g.c.d. of m and l}
\State $r\gets m\bmod l$
\While{$r\not=0$}\Comment{We have the answer if r is 0}
\State $m\gets l$
\State $l\gets r$
\State $r\gets m\bmod l$
\EndWhile\label{euclidendwhile}
\State \textbf{return} $l$\Comment{The gcd is l}
\EndProcedure
\end{algorithmic}
\end{talgorithm}

\lipsum[1]

\end{document}

Related Solutions

Algorithms – How to Set Width of Algorithm Environment (Preferably Document Wide)

\floatevery{algorithm}{\setlength\hsize{10cm}} would limit the algorithm environment to a width of 10cm, but would not center it. (For additional centering one needs to re-define internal macros of the float package which does not sound like an elegant solution to me.)

So I'm afraid, the solution you have found seems to be quite good and if you would like to have the width setting global you could simply change the definition of Algorithm, e.g.:


\documentclass{article}
\usepackage{algorithm}
\floatstyle{plain}
\newfloat{myalgo}{tbhp}{mya}

\newenvironment{Algorithm}[1][tbh]%
{\begin{myalgo}[#1]
\centering
\begin{minipage}{10cm}
\begin{algorithm}[H]}%
{\end{algorithm}
\end{minipage}
\end{myalgo}}

\begin{document}
\begin{Algorithm}[t]
\caption{Does work, though no nice solution.}
\end{Algorithm}
\end{document}

[Tex/LaTex] algorithm2e and Beamer – How to make algorithms wider with smaller font

The problem here is obvious... :)

You're scaling down the regularly allowed \textwidth algorithm to 65% of its original size. Since this scaling is done after setting the algorithm, the traditional line breaks still remain, making it seem like the algorithm is "cut short" on the right hand side.

Here's an abbreviated version of your algorithm showing the traditional line break:

enter image description here

Here's an update, where the algorithm is first set in a minipage of width 1.53846\textwidth, which makes \scalebox{0.65} result in a box of width \textwidth (that is, 1.53846 x 0.65 ~ 1):

enter image description here

\documentclass{beamer}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage[lined]{algorithm2e}
\usepackage{beamerthemesplit}
\begin{document}

\begin{frame}
  \frametitle{Premier algorithme}

  \scalebox{0.65}{%
  \begin{algorithm}[H]
    \Begin{
      \ForEach{Case $C$ de la grille $G$}{
        \If{$| poss(C) | \geq 2$}{
          \ForEach{$p \in poss(C)$}{
            $isole \leftarrow Vrai$
            \If{$isole = Vrai$}{
              Ne plus tester les possibilités restantes de la case $C$
            }
          }
        }
      }
      \Return $G$
    }
  \end{algorithm}}
\end{frame}   

\begin{frame}
  \frametitle{Premier algorithme}

  \scalebox{0.65}{\begin{minipage}{1.53846\textwidth}
  \begin{algorithm}[H]
    \Begin{
      \ForEach{Case $C$ de la grille $G$}{
        \If{$| poss(C) | \geq 2$}{
          \ForEach{$p \in poss(C)$}{
            $isole \leftarrow Vrai$
            \If{$isole = Vrai$}{
              Ne plus tester les possibilités restantes de la case $C$
            }
          }
        }
      }
      \Return $G$
    }
  \end{algorithm}%
  \end{minipage}}
\end{frame}   

\end{document}

If you wish to retain the natural look of the algorithm without using \scalebox, algorithm2e provides \SetAlFnt{<font>} where you can set the font size (or other font formatting options) for the entire algorithm. For example, \SetAlFnt{\footnotesize} will decrease the font size to \footnotesize.

Best Answer

Related Solutions

Algorithms – How to Set Width of Algorithm Environment (Preferably Document Wide)

[Tex/LaTex] algorithm2e and Beamer – How to make algorithms wider with smaller font

Related Question