I want to use the algorithm2e package in LyX (version 2.2.3). There is a LyX module that makes this task simple. However, I would like to adjust the arguments with which the package is imported.

The LaTeX code generated by LyX reads


What I want is something like

\usepackage[lined, algonl, boxed]{algorithm2e}

As pointed out in this post, the options with which a package imported by a module is loaded can be changed by going to Document > Settings > Local Layout and entering package options like

PackageOptions algorithm2e lined

This adds the line


to the source code before the import of algorithm2e. Accordingly, I have tried to pass multiple arguments:

PackageOptions algorithm2e lined
PackageOptions algorithm2e algonl
PackageOptions algorithm2e boxed

However, only the last PackageOptions line is considered in the code, which reads


This might be wanted behaviour (or not - I do not know whether PassOptionsToPackage can be applied multiple times). Nevertheless, the question remains: How can I add multiple package options?

I have tried to import algorithm2e in the "Latex-Preamble" in the document settings of LyX. However, this results in a conflict with the internal LyX solution. I get an error stating Command \algorithm already defined.

Would it be an option to write a new LyX module with adjusted import? How could I do this? The LyX documentation on modules is not detailed. I looked at the code of the algorithm2e module but did neither understand it completely nor find a line that I could adjust accordingly.

2 Answers 2


Load the algorithm2e module from Document > Settings... > Modules and then add the following to your Local Layout:

Format 60
PackageOptions algorithm2e "lined, algonl, boxed"

This ensures that all 3 options are passed to algorithm2e when loaded.


Werner's is the correct solution.

However, as an alternative, you could do the following.

Do not add the predefined module.

Go to Document > Settings > LaTeX Preamble and add directly:

\usepackage[lined, algonl, boxed]{algorithm2e}

The drawback of this solution is that, afterwards, you have to insert your algorithm by ERT code directly:

enter image description here

because, not having loaded its module, LyX doesn't know you're using that package.

  • This does not work, because it interferes with the builtin algorithm environment in LyX. I described this in my post above.
    – Samufi
    Oct 3, 2017 at 2:26
  • Thanks, @CarLaTeX. It still does not work, though - even with "Provides algorithm 1".
    – Samufi
    Oct 3, 2017 at 2:46
  • @Samufi My original solution works, but you have to write your algorithm with ERT. Werner's answer is better.
    – CarLaTeX
    Oct 3, 2017 at 4:34
  • I see... I guess, if I would have gone with ERT in the first place, the whole issue would not have come up. Thanks for researching, though @CarLaTeX!
    – Samufi
    Oct 3, 2017 at 6:21
  • @Samufi You're welcome! We're here to help. However, Werner's answer is more convenient, because you don't need to use ERT. :)
    – CarLaTeX
    Oct 3, 2017 at 6:37

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.