[Tex/LaTex] Include a line break in algorithm-caption while maintaining indentation

algorithmscaptionsline-breaking

I've a question about the alignment of the caption in an algorithm-environment. For instance, the following code-example

\documentclass{article}
\usepackage{algorithm}
\usepackage[noend]{algpseudocode}

\begin{document}
\begin{algorithm}[t]
\caption{Text Text\newline Text}
\begin{algorithmic}[1]
\State bla
\end{algorithmic}
\end{algorithm}
\end{document}

produces
enter image description here

However, the third "Text" should be directly under the first "Text". How can I accomplish this?

Best Answer

You can use the caption package with a hanging indent style as follows:

Sample output

Longer sample

\documentclass{article}

\usepackage{algorithm}
\usepackage[noend]{algpseudocode}
\usepackage{caption}

\captionsetup[algorithm]{format=hang,singlelinecheck=false}

\begin{document}

\begin{algorithm}[t]
\caption{Text Text\newline Text}  
\begin{algorithmic}[1]
\State bla
\end{algorithmic}
\end{algorithm}

\begin{algorithm}[t]
\caption{Text text text text text text text text text text text text
text text text text text text text text text text text text\newline
More text}
\begin{algorithmic}[1]
\State bla
\end{algorithmic}
\end{algorithm}

\end{document}

Related Solutions

[Tex/LaTex] Include a line break in algorithmic while maintaining indentation

The default indent for each block in the algorithmic environment (from the algorithmicx package) is \algorithmicindent. As such, you can place the entire line of code in a top-aligned \parbox[t] of adequate width or use the varwidth environment from the varwidth package, and indent as needed:

enter image description here

\documentclass{article}
\usepackage{algorithm}% http://ctan.org/pkg/algorithm
\usepackage{algpseudocode}% http://ctan.org/pkg/algorithmicx
\usepackage{varwidth}% http://ctan.org/pkg/varwidth
\begin{document}
\section{Struttura dati}
\begin{algorithm}
  \caption{Leggi file .gpx}\label{getgpx}
  \begin{algorithmic}[1]
    \State \begin{varwidth}[t]{\linewidth}
      speed~$\gets$~computeSpeed(\par
        \hskip\algorithmicindent gpx.track(i).segment(j).delta\_s(q),\par
        \hskip\algorithmicindent gpx.track(i).segment(j).delta\_t(q));
      \end{varwidth}
  \end{algorithmic}
\end{algorithm}
\end{document}

Here is another alternative that could be used instead. It utilized the a modified version of \Statex, also supplied by algorithmicx. It now takes an optional argument indicating the number of indents to apply to the specific line, without numbering it (default for \Statex).

enter image description here

\documentclass{article}
\usepackage{algorithm}% http://ctan.org/pkg/algorithm
\usepackage{algpseudocode}% http://ctan.org/pkg/algorithmicx
\makeatletter
\let\OldStatex\Statex
\renewcommand{\Statex}[1][3]{%
  \setlength\@tempdima{\algorithmicindent}%
  \OldStatex\hskip\dimexpr#1\@tempdima\relax}
\makeatother
\begin{document}
\section{Struttura dati}
\begin{algorithm}
  \caption{Leggi file .gpx}\label{getgpx}
  \begin{algorithmic}[1]
    \State speed~$\gets$~computeSpeed(
    \Statex gpx.track(i).segment(j).delta\_s(q),
    \Statex[2] gpx.track(i).segment(j).delta\_t(q));
  \end{algorithmic}
\end{algorithm}
\end{document}

Note that I've stripped the unnecessary preamble content from the minimal working example (MWE) posted above. This is encouraged when posting problems/question - something that can compile that reproduces the problem.

[Tex/LaTex] Customizing some aspect of algorithmic environment

To restart line numbering from 1, you have to reset the counter ALG@line, so we define a new command \resetline to be issued when you want that change:

\makeatletter
\newcommand{\resetline}{\setcounter{ALG@line}{0}}
\makeatother

In regards of the spacing between two functions, you can use a normal skip instead of issuing a \Statex (\smallskip, \medskip, \bigskip).

MWE

\documentclass{article}
\usepackage{algorithm}
\usepackage[noend]{algpseudocode}

\makeatletter
\newcommand{\resetline}{\setcounter{ALG@line}{0}}
\makeatother

\begin{document}

\begin{algorithm}[H]
    \caption{Calcola il grado di ogni vertice del grafo $G = (V,E)$}
    \label{degree}
    \begin{algorithmic}[1]
        \Function{\textsc{Map}$( \left \langle u;v \right \rangle )$}{}
            \State \textbf{emit} $\left \langle u;v \right \rangle$
        \EndFunction
        \medskip\resetline
        \Function{\textsc{Reduce}$( \left \langle u;\Gamma(u) \right \rangle )$}{}
            \State $d(u) \gets 0$
            \ForAll{$v \in \Gamma(u)$}
                \State $d(u) \gets d(u) + 1$
            \EndFor
            \State \textbf{emit} $\left \langle u;d(u) \right \rangle$
        \EndFunction
    \end{algorithmic}
\end{algorithm}

\end{document}

Output:

enter image description here

The little gap related to the noend option is to indicate the end of the function, so I'll leave it as is, but if you really want to remove it, you can add these lines in your preamble (require the etoolbox package):

\patchcmd{\ALG@doentity}
  {\item[]\nointerlineskip}
  {\relax}
  {}
  {}

Complete code:

\documentclass{article}
\usepackage{algorithm}
\usepackage[noend]{algpseudocode}
\usepackage{etoolbox}

\makeatletter
\newcommand{\resetline}{\setcounter{ALG@line}{0}}
\patchcmd{\ALG@doentity}
  {\item[]\nointerlineskip}
  {\relax}
  {}
  {}
\makeatother

\begin{document}

\begin{algorithm}[H]
    \caption{Calcola il grado di ogni vertice del grafo $G = (V,E)$}
    \label{degree}
    \begin{algorithmic}[1]
        \Function{\textsc{Map}$( \left \langle u;v \right \rangle )$}{}
            \State \textbf{emit} $\left \langle u;v \right \rangle$
        \EndFunction
        \medskip\resetline
        \Function{\textsc{Reduce}$( \left \langle u;\Gamma(u) \right \rangle )$}{}
            \State $d(u) \gets 0$
            \ForAll{$v \in \Gamma(u)$}
                \State $d(u) \gets d(u) + 1$
            \EndFor
            \State \textbf{emit} $\left \langle u;d(u) \right \rangle$
        \EndFunction
    \end{algorithmic}
\end{algorithm}

\end{document}

Output:

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] Include a line break in algorithmic while maintaining indentation

[Tex/LaTex] Customizing some aspect of algorithmic environment

Related Question