Nested If and For in algorithm2e

Question

I have the following code in algorithm2e with boxruled, vlined, and linesnumbered options. pdflatex gives me an empty line at the end of both the for loops inside the ifs. Can someone please suggest a way to get rid of the extra lines? Thanks.

\If {$\lfloor c\ (\log (n+1) - \log n) \rfloor > 1$}
{
    $u \leftarrow {\tt SampleControl}$\;
    $U \leftarrow \{ u \} \cup U_m$\;
}
${\tt ConnectState}(z, S_{n+1}, U, P_n, Q_n, \delta_n)$\;
\eIf{$\min_{u \in U} \Delta t_{n+1} (z_{n+1}, u) \leq \delta_n$}
{   $\delta_{n+1} = \delta_n/2$\;
    \For{$z \in S_{n+1}$}{
        ${\tt ConnectState}(z, S_{n+1}, U, P_{n+1}, Q_{n+1}, \delta_{n+1})$\;
}}{ $\delta_{n+1} \leftarrow \delta_n$\;
    \For{$z' \in Z_\mathrm{near}(z_{n+1})$}{
        ${\tt ConnectState}(z', S_{n+1}, U, P_{n+1}, Q_{n+1}, \delta_{n+1})$\;
}}

Welcome to TeX.SX! Please, add a minimal preamble to your code so that it becomes a complete example that can be run through LaTeX. — egreg
– egreg, Commented Sep 16, 2012 at 11:08

Heiko Oberdiek · Accepted Answer · 2012-09-16 11:35:03Z

1

Perhaps you mean the additional vertical space at the end of the if and for blocks. It can be configured by \SetVlineSkip:

\documentclass{article}
\usepackage[boxruled,vlined,linesnumbered]{algorithm2e}

\SetVlineSkip{0pt}      

\begin{document}

\begin{algorithm}
\caption{Caption of algorithm}
\If {$\lfloor c\ (\log (n+1) - \log n) \rfloor > 1$}
{
    $u \leftarrow {\tt SampleControl}$\;
    $U \leftarrow \{ u \} \cup U_m$\;
}
${\tt ConnectState}(z, S_{n+1}, U, P_n, Q_n, \delta_n)$\;
\eIf{$\min_{u \in U} \Delta t_{n+1} (z_{n+1}, u) \leq \delta_n$}
{   $\delta_{n+1} = \delta_n/2$\;
    \For{$z \in S_{n+1}$}{
        ${\tt ConnectState}(z, S_{n+1}, U, P_{n+1}, Q_{n+1},
\delta_{n+1})$\;
}}{ $\delta_{n+1} \leftarrow \delta_n$\;
    \For{$z' \in Z_\mathrm{near}(z_{n+1})$}{
        ${\tt ConnectState}(z', S_{n+1}, U, P_{n+1}, Q_{n+1},
\delta_{n+1})$\;
}}
\end{algorithm}

\end{document}

BTW, \SetVlineSkip is defined as:

\newcommand{\SetVlineSkip}[1]{\skiphlne=#1}%

A better definition for \SetVlineSkip would be (terminating of the assignment, support of package calc):

\renewcommand*{\SetVlineSkip}{\setlength{\skiphlne}}

answered Sep 16, 2012 at 11:35

Heiko Oberdiek

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Thanks a lot for your answer. I however just realised that the extra vspace shows up if I use \IncMargin{} in ieeeconf.cls. It does not show up in the article class. Any suggestions to get incmargin and still remove the white space? :)

Pratik C
– Pratik C

2012-09-17 01:08:19 +00:00
Commented Sep 17, 2012 at 1:08
The class file is IEEEconf.cls. In twocolumn mode the line width is too small and you get overfull \hbox warnings. Fix them and then also the additional white space should disappear.

Heiko Oberdiek
– Heiko Oberdiek

2012-09-17 01:26:24 +00:00
Commented Sep 17, 2012 at 1:26
I solved this problem by reducing the font in the algorithm environment, saves more space for my paper and looks better as well!

Pratik C
– Pratik C

2012-09-29 22:48:20 +00:00
Commented Sep 29, 2012 at 22:48

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