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I would like to mark (e.g. with a *) a line in a pseudo-code typeset with the algorithmic package. I would like the label to appear on the left margin, instead of the line number. Is that possible?

I would like to have something like this:

  a = 5
  b = 7
* if a < b then
    ...
  end if
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1 Answer 1

Use a \marginpar.

\documentclass{article}
\usepackage{algorithmic}
\reversemarginpar % left hand
\begin{document}
\begin{algorithmic}
\STATE foo\marginpar{\hfill*}
\STATE bar
\end{algorithmic}
\end{document}

In two-sided document, you must test if the page number is odd using \ifoddpage from changepage, and choose \reversemarginpar or \normalmarginpar.

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