\eIf{$list size > 0$} 我在位置输入此 if 语句后尝试打开 if 语句\elf{$stopAfterNext$ is not empty}，但出现以下错误。只要从中删除斜线，我就可以编译文档 elf{$stopAfterNext$ is not empty}。我该如何修复它？
错误：
! Undefined control sequence.
<recently read> \elf
l.26 }
代码：
\documentclass{article}
%\usepackage{algorithmic}% http://ctan.org/pkg/algorithms
\usepackage[]{algorithm2e}
\begin{document}
\begin{algorithm}[H]
\SetAlgoLined
\KwData{latitude, longitude, mac, route, direction}
%\KwResult{how to write algorithm with \LaTeX2e }
initialize $list$ as an empty list of integers. \\
%\While{not at end of this document}{
%read current\;
$list$ = Get stop Order from behaviour; \\
\eIf{$list size > 0$}{
find the last stop name in the behaviour table of this mac;\\
find the $stop\_id$ of the current location; \\
find all possible avialable next stops of this
$stop\_id$; \\
calculate the distance to all after next;\\
insert the result into after next; \\
String $stopAfterNext$ = check $stop\_name$ with $stop\_distance < 150$ in after next table; \\
\elf{$stopAfterNext$ is not empty}{ \\
String $stopBetween$ = find the name in the stops table;\\
}
}{
find the closet stop of the producer current location; \\
insert it into next table; \\
find initializer; \\
\eIf{initializer is available}{
get the initializer stop name; \\
restore all stop name for this mac to the behaviour table;
}
}
\caption{Detection algorithm.}
\end{algorithm}
\end{document}
答案1
我不太确定这是否是您期望的输出，但编译时没有错误：
\documentclass{article}
\usepackage[]{algorithm2e}
\begin{document}
\begin{algorithm}[H]
\SetAlgoLined
\KwData{latitude, longitude, mac, route, direction}
%\KwResult{how to write algorithm with \LaTeX2e }
initialize $list$ as an empty list of integers. \\
%\While{not at end of this document}{
%read current\;
$list$ = Get stop Order from behaviour; \\
\eIf{$list size > 0$}{
find the last stop name in the behaviour table of this mac;\\
find the $stop\_id$ of the current location; \\
find all possible avialable next stops of this
$stop\_id$;
calculate the distance to all after next;\\
insert the result into after next; \\
String $stopAfterNext$ = check $stop\_name$ with $stop\_distance < 150$ in after next table; \\
\eIf{$stopAfterNext$ is not empty}{%\\
String $stopBetween$ = find the name in the stops table;
}
}{%
find the closet stop of the producer current location; \\
insert it into next table; \\
find initializer; \\
\eIf{initializer is available}{
get the initializer stop name; \\
restore all stop name for this mac to the behaviour table;
}
}
\caption{Detection algorithm.}
\end{algorithm}
\end{document}