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I am using the algorithm2e package to add some algorithms to my thesis with the following line in my preamble:

\usepackage[]{algorithm2e}

However, I am unable to add the list of algorithms to my table of contents. I get the following error message when I try to use \listofalgorithms

(./doc.loa
! Missing number, treated as zero.
<to be read again> 
                   \edef 
l.2 ...gnorespaces Simple Algorithm}}{1}{algocf.1}

I believe the issue is related to the use of these two files -- puthesis.cls and pulongtable.sty which I am required to use for my thesis. I have included a minimum working example below which throws the error when I run pdflatex on it twice.

Added by muzimuzi Z: To run the following example, you need to aquire notoccite.sty as well.

\documentclass[ece,bypass]{puthesis}
\usepackage{float}
\usepackage{hyperref}
\usepackage[]{algorithm2e}
\title{MWE}
\author{Zuko Aang}{Aang, Zuko}
\campus{Indianapolis}

\begin{document}
\volume

\listofalgorithms

\chapter{Hello}
\section{Test}
\begin{algorithm}[H]
  \caption{Simple Algorithm}
  Hello
  \label{alg:Simple Algorithm}
\end{algorithm}

\end{document}

Any help would be much appreciated. Thanks

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2
  • 1
    Would you please provide an mwe so that others can use it as a start to help you? Commented May 21, 2020 at 6:49
  • Hi, I have added an mwe and more details as suggested. Thanks! Commented May 21, 2020 at 8:36

1 Answer 1

Reset to default
1

Solution

Redefine \l@algocf:

\documentclass[ece,bypass]{puthesis}
\usepackage{float}
\usepackage{algorithm2e}
\usepackage{hyperref}

\title{MWE}
\author{Zuko Aang}{Aang, Zuko}
\campus{Indianapolis}

\makeatletter
\renewcommand*\l@algocf{\@dottedtocline{1}{\smalltocskip}{1em}{2.3em}}
\makeatother

\begin{document}
\volume
\listofalgorithms

\chapter{Hello}
\section{Test}
\begin{algorithm}[H]
  \caption{Simple Algorithm}
  Hello
  \label{alg:Simple Algorithm}
\end{algorithm}

\end{document}

Explanation

In puthesis.cls, command \@dottedtocline is redefined to accept an extra argument as its new second argument. This #2 represents the extra vertical skip before every content item (e.g., a section in \tableofcontents or an algorithm \listofalgorithms). In puthesis.cls, \smalltocskip is passed to the #2 of \@dottedtocline in redefinition of commands like \l@section and \l@subsection. For example,

% before, in report.cls
\newcommand*\l@section{\@dottedtocline{1}{1.5em}{2.3em}}
\newcommand*\l@subsection{\@dottedtocline{2}{3.8em}{3.2em}}

% after, in puthesis.cls (comments are copied from puthesis.cls too)
% Got these lines using "grep dotted report.cls" and changed
% as needed for new \@dottedtocline \vskip parameter.
\renewcommand*\l@section{\@dottedtocline{1}{\smalltocskip}{1.5em}{2.3em}}
\renewcommand*\l@subsection{\@dottedtocline{2}{\smalltocskip}{3.8em}{3.2em}}

Hence, the solution is to redefine the internal command of an algorithm item in \listofalgorithms, which is \l@algocf, to sync with the change of \@dottedtocline.

% before, in algorithm2e.sty
% \newcommand*\l@algocf{\@dottedtocline{1}{1em}{2.3em}}

% after, in my answer
\renewcommand*\l@algocf{\@dottedtocline{1}{\smalltocskip}{1em}{2.3em}}
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2
  • Thank you very much. That did the trick. I am very grateful. Btw, I did include links to puthesis.cls and pulongtable.sty as hyperlinks in the edited question. Is that not the correct way to include links? Commented May 21, 2020 at 10:08
  • @zuko I missed the links in your question. So sorry. Updated my answer. Commented May 21, 2020 at 10:48

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