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I am having issues figuring out how to reference an algorithm created with algorithm2e. For my figures, I use:

\begin{figure}
  \includegraphics{...}
  \caption{Test Caption.}
  \label{fig:test_label}
\end{figure}

and the reference with \Cref{fig:test_label} (using package cleveref). All works fine.

However, this does not seem to work with algortihm2e:

\begin{algorithm}
  \For{$b\gets 0$ \KwTo $B- 1$}{
      ...
  }
  \caption{Test Caption} 
  \label{alg:test_label}
\end{algorithm}

and then doing \Cref{alg:test_label} results in ??. I would like to have something similar to Figure 1, i.e. Algorithm 1 or Alg. 1.

How do I properly reference an algorithm created with algorithm2e?

Thanks!

EDIT: Upon further inspection, I noticed that the numbers are actually showing, but the word Algorithm is missing: ?? 1, ?? 2,...

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  • 1
    Did you compile your test document twice? Commented Mar 7, 2023 at 16:23
  • 1
    Welcome to TeX.SX! Please help us help you and add a minimal working example (MWE) that illustrates your problem. Reproducing the problem and finding out what the issue is will be much easier when we see compilable code, starting with \documentclass{...} and ending with \end{document}. Commented Mar 7, 2023 at 16:27
  • @Mico Yes, I compiled it twice. Commented Mar 8, 2023 at 6:29
  • @John Right, I ripped that out for the question here. Sry. Its back in there now. Commented Mar 8, 2023 at 6:30

1 Answer 1

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I'm puzzled by your claim that

However, this does not seem to work with algortihm2e

For sure, the following minimalist test program

\documentclass{article} 
\usepackage{algorithm2e,cleveref}
\begin{document}

\begin{algorithm}
  \centering\dots \caption{Test a}\label{alg:a}
\end{algorithm}
\begin{algorithm}
  \centering\dots \caption{Test b}\label{alg:b}
\end{algorithm}

\Cref{alg:b}, \cref{alg:a,alg:b}.
\end{document}

produces this result after compiling twice:

enter image description here

However, be sure to include the package algorithm2e before cleveref, otherwise you will end up with:

enter image description here

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  • Thanks. Indeed, it works. My issue was the order of including the two packages. I edited your answer to include this. Commented Mar 8, 2023 at 6:45
  • @Fabian - The general piece of advice is to load cleveref last. Commented Mar 8, 2023 at 11:40

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