2

I know that procedure in algorithm2e only allows captions like \caption{ProcedureName()}.

However, I'd like my procedure to appear in small caps:

\documentclass[12pt,a4paper]{article}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{enumerate}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage[algosection, boxruled, linesnumbered]{algorithm2e}

\begin{document}
\begin{procedure}

    \SetKwInOut{Input}{input}
    \SetKwInOut{Output}{output}
    \Input{Graph $G = (V,E)$}
    \Output{}
    \ForEach{node $v \in V$}
    {
        \lIf{$v$ is marked}{remove $v$}
    }

    \caption{\textsc{removemarked()}}
    \label{alg:removemarked}

\end{procedure}
\end{document}

Which of course gives error

Paragraph ended before \algocf@captname was complete

Instead of procedure, if I use \begin{algorithm} ... \end{algorithm}, then it forks fine. Is there a way to make it work in procedure as well?

3

It's not really well documented in algorithm2e manual, but to achieve what you want, you have to issue the command

\SetProcNameSty{textsc}

The argument of \caption when using the procedure environment can only contain something like name(arg).

In the following MWE I've also added

\SetProcArgSty{textsc}

just in case you are using procedure captions with arguments:

\documentclass[12pt,a4paper]{article}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{enumerate}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage[algosection, boxruled, linesnumbered]{algorithm2e}

\SetProcNameSty{textsc}
\SetProcArgSty{textsc}

\begin{document}
\begin{procedure}

    \SetKwInOut{Input}{input}
    \SetKwInOut{Output}{output}
    \Input{Graph $G = (V,E)$}
    \Output{}
    \ForEach{node $v \in V$}
    {
        \lIf{$v$ is marked}{remove $v$}
    }

    \caption{removemarked()}
    \label{alg:removemarked}

\end{procedure}
\end{document} 

Output

enter image description here

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