包 {algorithmicx} 中使用“Require”和“Ensure”时出现行号错误

Question

我正在使用包algorithmicx和algpseudocode在论文中编写算法。指定注释比使用更方便、更美观algorithmic。

但是我在使用“Require and Ensure”时遇到错误。行号总是错误的。

平均能量损失

\documentclass{article}
\usepackage{amsmath}
\usepackage{algorithm}
\usepackage{algpseudocode}
\begin{document}

\begin{algorithm}[ht]
\caption{My first algorithm}
\label{alg:algorithm1}

\begin{algorithmic}[1]
\Require~~\\
 If there are multiple lines here, line's number will be wrong.\\
 This error doesn't happen in package\{algorithmic\}
\Ensure~~\\
 If I write $\setminus\setminus$ here, line's number will be wrong too.
\Statex
\If{$i = 1 \to n$} \Comment{This line's number should be 1}
  \State ${\textit{HU}}_{i} \gets {\textit{NGU}}_{i} + {HU}_{i}$ \Comment{Comment}
\EndIf

\end{algorithmic}
\end{algorithm}
\end{document}

输出

问题

我需要在“Require”项中写两行。我该如何解决这个行数问题？

Answer 1

algorithmicx将环境维护algorithmic为列表。因此，您可以使用该\Statex命令插入未编号的项目，类似于插入空行：

\documentclass{article}
\usepackage{algorithm,algpseudocode}% http://ctan.org/pkg/{algorithms,algorithmicx}
\begin{document}

\begin{algorithm}[ht]
  \caption{My first algorithm}\label{alg:algorithm1}
  \begin{algorithmic}[1]
    \Require
      \Statex If there are multiple lines here, line's number will be wrong.
      \Statex This error doesn't happen in package \verb|algorithmic|.
    \Ensure
      \Statex If I write \verb|\\| here, line's number will be wrong too.
    \Statex
    \If{$i = 1 \to n$} \Comment{This line's number should be 1}
      \State ${\textit{HU}}_{i} \gets {\textit{NGU}}_{i} + {HU}_{i}$ \Comment{Comment}
    \EndIf
  \end{algorithmic}
\end{algorithm}
\end{document}