# Add the word “Algorithm” before each entry in the List of Algorithms

I'm trying to add the word "Algorithm" before each entry in the List of Algorithms (because of unavoidable thesis guidelines).

I saw similar questions but the solutions listed there don't work for me. I'm not sure about reopening those questions, hence posting it separately. Apologize if that's not the right etiquette.

Is it possible to change the way a list of algorithms is generated to include the word "Algorithm" before each element in the list? (I'm using "algorithm" package instead of "algorithm2e")

Add algorithm label to list of algorithms (not sure if solutions listed there require other packages as listed solutions don't work for me)

Current output:

List of Algorithms
1 Optimization . . . . . . . . 3


Desired output:

List of Algorithms
Algorithm 1 Optimization . . . . . . . . 3


Here's a simplified code sample that illustrates the issue. Your help is much appreciated. Please let me know how to get desired behavior for this sample.

\documentclass[letter,10pt]{book}
\usepackage[utf8x]{inputenc}

\usepackage{algorithm}
\usepackage{algorithmic}

\title{Sample book}
\begin{document}
\listofalgorithms

\chapter{Sample}
% Outline
\begin{algorithm}[!hbt]
\centering
\caption{Optimization}\label{alg:pso}
\begin{algorithmic}[1]
\STATE \textit{GenerateInitialPopulation}(pop)
\FOR {particle $\leftarrow$ 1 \textit{to} numParticles}
\STATE \textit{Evaluate}(particle)
\ENDFOR
\end{algorithmic}
\end{algorithm}

\end{document}


The following piece of code will insert Algorithm~ before each number of the algorithm in the List of Algorithms (LoA):

\begingroup
\let\oldnumberline\numberline
\renewcommand{\numberline}{Algorithm~\oldnumberline}
\listofalgorithms
\endgroup


It redefines the \numberline macro that inserts and sets the algorithm number into the LoA. For a good discussion on the meanings and placement/usage of these macros, read the tocloft package documentation (section 1.1 LaTeX's methods). Bracing (or grouping using \begingroup...\endgroup) localizes the scope so it does not affect \numberline used by other contents structures. Here's the full code that redefines \listofalgorithms so it can be cleanly used inside your document body:

\documentclass{book}
\usepackage{algorithm,algorithmic}

\let\oldlistofalgorithms\listofalgorithms
\renewcommand{\listofalgorithms}{%
\begingroup%
\let\oldnumberline\numberline%
\renewcommand{\numberline}{Algorithm~\oldnumberline}%
\oldlistofalgorithms%
\endgroup}
\begin{document}

\listofalgorithms

\chapter{Sample}
% Outline
\begin{algorithm}[!hbt]
\centering
\caption{Optimization}\label{alg:pso}
\begin{algorithmic}[1]
\STATE \textit{GenerateInitialPopulation}(pop)
\FOR {particle $\leftarrow$ 1 \textit{to} numParticles}
\STATE \textit{Evaluate}(particle)
\ENDFOR
\end{algorithmic}
\end{algorithm}

\end{document}


If you wish to avoid the horizontal space introduced between the margin and the algorithm contents entries, you can use the following redefinition of \listofalgorithms:

\makeatletter
\renewcommand{\listofalgorithms}{%
\begingroup%
\let\oldnumberline\numberline%
\let\old@dottedtocline\@dottedtocline
\renewcommand{\@dottedtocline}[5]{\old@dottedtocline{##1}{0pt}{##3}{##4}{##5}}%
\renewcommand{\numberline}{Algorithm~\oldnumberline}%
\oldlistofalgorithms%
\endgroup}
\makeatother


The above update of \@dottedtocline changes the default 1.5em spacing usually placed in the second argument with 0pt.

• Works great. Thanks for the quick response! – Sarat Feb 6 '13 at 3:37
• This works but leaves horizontal space on the left. No way to override the \contentsline directly? – the swine Mar 11 '16 at 0:14
• @theswine: See my updated answer. – Werner Mar 11 '16 at 0:32
• @Werner oh, nice, just slapped \let\oldlistofalgorithms\listofalgorithms on top and works like a charm. Thanks a lot (upvoted yesterday already). – the swine Mar 11 '16 at 9:48

Both worked for me:

\makeatletter
\let\l@algocf\l@figure
\makeatother
\let\oldfigurename\figurename
\renewcommand{\figurename}{\algorithmcfname}
\listofalgorithms
\renewcommand{\figurename}{\oldfigurename}


and

\let\oldlistofalgorithms\listofalgorithms
\let\oldnumberline\numberline%
\newcommand{\algnumberline}[1]{Algorithm~#1 -- }
\renewcommand{\listofalgorithms}{%
\let\numberline\algnumberline%
\oldlistofalgorithms
\let\numberline\oldnumberline%
}


The first considers that the table of figures already have the desired formatting.