algorithm2emacrospseudocode
I'm trying to format a "repeat forever" block using algorithm2e. I've found the \Repeat command but this prints an until at the end of my block. I can hide the word until using:
\SetKwRepeat{Repeat}{repeat}{}
But then a blank line appears. I'm currently using the noend option so I'd like to completely remove the closing clause. How can I get rid of this blank line?
You most certainly triggered a bug in algorithm2e. While the manual is not very clear on that, I guess the behaviour of the end version is correct, and the label should refer to the last line of the block. The reason for this bug is that \label picks up \@currentlabel, but algorithm2e uses its own counter AlgoLine, and this is not pushed to \@currentlabel in all situations. The funny thing is that algorithm2e has special code for label handling when hyperref is loaded, and then everything works correct. So your recipe is:
1. Inform the maintainer of algorithm2e about this bug.
2a. Use the hyperref package.
2b. If you don't want to use hyperref, the following code defines a new labeling command, \elabel, which works as expected:
\documentclass{article}
\usepackage[lined,linesnumbered,noend]{algorithm2e}
\usepackage{hyperref}
\makeatletter
\@ifpackageloaded{hyperref}{%
\def\elabel#1{\label{#1}}%
}{%
\def\elabel#1{\@bsphack \protected@write \@auxout {}{\string \newlabel {#1}{{\theAlgoLine }{\thepage }}}\@esphack}%
}
\makeatother
\begin{document}
\SetAlgoShortEnd%
\begin{algorithm}%
\For {...} { a = b\; } \label{ya}\elabel{ya2}
\end{algorithm}%
\textbackslash{}label gives \ref{ya}, \textbackslash{}elabel is \ref{ya2}%
\SetAlgoNoEnd%
\begin{algorithm}%
\For {...} { a = b }\label{xa}\elabel{xa2}
\end{algorithm}%
\textbackslash{}label is \ref{xa}, \textbackslash{}elabel is \ref{xa2}%
\end{document}
Supposing your document is in German , loading babel with german set via document class does the trick. To replace end with endfor, overwrite the definition of For with \SetKwFor:
\documentclass[german] {article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{babel} \usepackage[linesnumbered, ruled, vlined]{algorithm2e}
\SetKwFor{For}{for}{do}{endfor for}%
\begin{document}
\SetAlgoNoLine
\begin{algorithm}[H]
\DontPrintSemicolon
\KwIn{$X_{t-1}, u_t ยท z_t$}
\KwOut{$X_t$}
$\overline{X_t} = X_t = 0$\;
\For{$k = 1$ to $M$}{
$x^{[k]}_t = sample\_motion\_model(u_t, x^{[k]}_{t-1})$\;
$w^{[k]}_t = measurement\_model(z_t, x^{[k]}_t, m_{t-1})$\;
$m^{[k]}_t = updated\_occupancy\_grid(z_t, x^{[k]}_t, m^{[k]}_{t-1})$\;
$\overline{X_t} = \overline{X_t} + \langle x_x^{[m]}, w_t^{[m]} \rangle $\;
}
\For {$k = 1$ to $M$}{
draw $ i $ with probability $\approx w_t^{[i]}$\;
add $\langle x_x^{[m]}, w_t^{[m]} \rangle$ to $X_t$\;
}
\Return $X_t$
\caption{FastSLAM}
\end{algorithm}
\end{document}
Best Answer
You could use
\SetKwBlock: