在算法下方添加文本

Question

我尝试在算法的底线下方添加一些用于说明算法的文本。

\documentclass{article}
\usepackage[ruled]{algorithm2e}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage[hang,flushmargin]{footmisc}
\usepackage{caption}
\begin{document}
\begin{algorithm}
 \caption{How to write algorithms}\label{algorithm1}
 \KwIn{this text}
 \KwOut{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\;
   }{
   $y_0\leftarrow y$\;
  }
 }
\end{algorithm}
\end{document}

我想在底线下方添加一些文字，如下所示：

基于如何为 algorithmicx 的评论创建脚注，应该使用minipage。我更新了我的代码如下：

\documentclass{article}
\usepackage[ruled]{algorithm2e}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage[hang,flushmargin]{footmisc}
\usepackage{caption}
\begin{document}
\noindent\begin{minipage}{\textwidth}
\begin{algorithm}
 \caption{How to write algorithms}\label{algorithm1}\footnotetext{$y_0$ denotes the initial value.}
 \KwIn{this text}
 \KwOut{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\;
   }{
   $y_0\leftarrow y$\;
  }
 }
\end{algorithm}
\renewcommand\footnoterule{}
\end{minipage}
\end{document}

但会出现错误。

任何建议都将不胜感激。

Answer 1

建设algorithm2e的浮动很复杂，因为它允许指定一个静止的H浮动位置，而无需使用float。此外，它还管理在顶部或底部放置标题以适应不同的风格。因此，为了满足您对此浮动内脚注的要求，您需要将其拆分到不会影响构造中其他组件的地方。这里有一个补丁，它提供\algorithmfootnote[<style>]{<stuff>}（<style>默认为\footnotesize）：

\documentclass{article}
\usepackage[ruled]{algorithm2e}
\usepackage{amssymb,amsmath,caption}
\usepackage[hang,flushmargin]{footmisc}
\usepackage{lipsum}
\makeatletter
\newcommand{\algorithmfootnote}[2][\footnotesize]{%
  \let\old@algocf@finish\@algocf@finish% Store algorithm finish macro
  \def\@algocf@finish{\old@algocf@finish% Update finish macro to insert "footnote"
    \leavevmode\rlap{\begin{minipage}{\linewidth}
    #1#2
    \end{minipage}}%
  }%
}
\makeatother
\begin{document}
\lipsum[1-3]
\begin{algorithm}[tb]
  \caption{How to write algorithms}\label{algorithm1}
  \algorithmfootnote{$y_0$ denotes the initial value.}
  \KwIn{this text}
  \KwOut{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\;
      }{
      $y_0 \leftarrow y$\;
    }
  }
\end{algorithm}
\end{document}

Answer 2

LaTeX Error: Not in outer par mode由于 内部浮动算法而导致的结果minipage。您可以使用[H]位置说明符来摆脱这种情况。另外，我已经将其放在开始\renewcommand\footnoterule{}之后minipage，否则就太晚了。

\documentclass{article}
\usepackage[ruled]{algorithm2e}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage[hang,flushmargin]{footmisc}
\usepackage{caption}
\begin{document}
\noindent\begin{minipage}{\textwidth}
\renewcommand\footnoterule{}                  %% This line should come here.
\begin{algorithm}[H]                          %% <-------------
 \caption{How to write algorithms}\label{algorithm1}\footnotetext{$y_0$ denotes the initial value.}
 \KwIn{this text}
 \KwOut{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\;
   }{
   $y_0\leftarrow y$\;
  }
 }
\end{algorithm}
\end{minipage}
\end{document}