[Tex/LaTex] Algorithm2e caption above code

algorithm2ecaptionspositioning

I can't seem to figure out how to place a caption at the beginning of an algorithm2e pseudo code. I know it's possible with the ruled environment, but I don't want those lines at the top and the bottom. How can I move the algorithm caption above the code?

Best Answer

You could adjust the way the plain (default) style sets the caption (from bottom to above or top):

enter image description here

\documentclass{article}
\usepackage{algorithm2e}% http://ctan.org/pkg/algorithm2e
\makeatletter
\renewcommand{\@algocf@capt@plain}{above}% formerly {bottom}
\makeatother
\begin{document}

\begin{algorithm}[H]
  \SetAlgoLined
  \KwData{this text}
  \KwResult{how to write algorithm with \LaTeX2e }
  initialization\;
  \While{not at end of this document}{
    read current\;
    \eIf{understand}{
      go to next section\;
      current section becomes this one\;
    }{
      go back to the beginning of current section\;
    }
  }
  \caption{How to write algorithms}
\end{algorithm}

\end{document}

Related Solutions

[Tex/LaTex] Caption spacing using algorithm2e

To use the command \captionsetup you must have loaded the caption package...

Anyway, this can be done without it.

First of all, the spacing between the caption and the rest of the text is null because you are preventing the algorithm to float using H as a position specifier. Use h instead, which means "place it here" but keeps the algorithm a floating object (the same as h for figures and tables).

Then you can adjust the spacing between the body of the algorithm and its caption through the command \SetAlCapSkip.

In other words, substituting the line

\begin{algorithm}[H]

with

\begin{algorithm}[h]

and inserting

\SetAlCapSkip{1em}

in the preamble (adjust 1em to your needs) should be what you want.

Complete MWE

\documentclass[a4paper]{article}

\usepackage{blindtext}
\usepackage[linesnumbered,boxed]{algorithm2e}

\SetAlCapSkip{1em}

\SetKwInput{KwInput}{Input}
\SetKwInput{KwOutput}{Output}

\begin{document}

  \begin{algorithm}[h]
    \SetAlgoLined
    \KwInput{Parameters...}

    \KwOutput{$\emptyset$}

    \If{Condition}
    {
      Do something \;
    }
    \caption{Algoritm test...}
  \end{algorithm}

  \blindtext{}

  \begin{figure}[!h]
    \caption{Figure test...}
  \end{figure}

  \blindtext{}

\end{document}

Output

enter image description here

[Tex/LaTex] Adjusting the caption of an algorithm2e code

You can get captions identical to the ones for figure in the following way:

\documentclass[10pt]{article}
\usepackage{showframe}
\usepackage[figure,noend,noline,linesnumbered]{algorithm2e}
\usepackage[font=bf,skip=\baselineskip]{caption}
\usepackage{etoolbox}
\AtBeginEnvironment{algorithm}{%
  \captionsetup{margin={-\algomargin,\algomargin}}%
}

\begin{document}
\begin{figure}[h]

\caption{Here is a long caption for an algorithm. I'd like to typeset 
  the caption such that it is bold and fills the available width of 
  the page without encroaching into margins.}

\end{figure}
\begin{algorithm}[h]
\raggedright
Some algorithm step \;
\caption{Here is a long caption for an algorithm. I'd like to typeset 
  the caption such that it is bold and fills the available width of 
  the page without encroaching into margins.}
\end{algorithm}
\end{document}

However every caption to algorithm will issue a spurious

Overfull \hbox (7.5pt too wide)

message.

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] Caption spacing using algorithm2e

[Tex/LaTex] Adjusting the caption of an algorithm2e code

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