I got myself in big trouble and I can't get out of it.

I use `standalone`

package to combine different latex files into one. Each Latex file compiles OK on its own. When I combined them, I found a conflict, since I used `algorithm2e`

in one file and used `algorithm`

in another to type different algorithms. With `standalone`

one must include the union of all packages used in all the files. So I have to include both packages now. I am stuck now. I do not want to rewrite the algorithm I did, as it took long time.

Here is a MWE

```
\documentclass[11pt]{article}%
\usepackage{amsmath}
\usepackage[linesnumbered,ruled,lined,boxed,algo2e]{algorithm2e}
\usepackage{algorithm,algorithmicx,algpseudocode}
\begin{document}
\begin{algorithm}[H]
\begin{algorithmic}[1]
\If {$i\geq 1$}
\State $i\gets 0$
\Else
\State $i\gets 2$
\EndIf
\end{algorithmic}
\end{algorithm}
\end{document}
```

And the error is

```
pdflatex foo.tex
Document Style algorithmicx 1.2 - a greatly improved `algorithmic' style
) (/usr/local/texlive/2015/texmf-dist/tex/latex/algorithmicx/algpseudocode.sty
Document Style - pseudocode environments for use with the `algorithmicx' style
) (./foo.aux)
! You can't use `\prevdepth' in horizontal mode.
\nointerlineskip ->\prevdepth
-\@m \[email protected]
l.13 \State $
i\gets 0$
?
```

if I comment out `algorithm2e`

it compiles OK. But again, I have to include both in the master document since it using standalone to combine many different latex files and one of the other files (not shown here) needs `algorithm2e`

.

Any way to handle this situation? I am using TL 2015. note that I also have to use pdflatex and not lualatex, since `algorithm2e`

does not compile with lualatex.

```
*File List*
article.cls 2014/09/29 v1.4h Standard LaTeX document class
size11.clo 2014/09/29 v1.4h Standard LaTeX file (size option)
amsmath.sty 2013/01/14 v2.14 AMS math features
amstext.sty 2000/06/29 v2.01
amsgen.sty 1999/11/30 v2.0
amsbsy.sty 1999/11/29 v1.2d
amsopn.sty 1999/12/14 v2.01 operator names
algorithm.sty 2009/08/24 v0.1 Document Style `algorithm' - floating
float.sty 2001/11/08 v1.3d Float enhancements (AL)
ifthen.sty 2014/09/29 v1.1c Standard LaTeX ifthen package (DPC)
algorithmicx.sty 2005/04/27 v1.2 Algorithmicx
algpseudocode.sty
algorithm2e.sty 2013/01/06 v5.00 algorithms environments
xspace.sty 2014/10/28 v1.13 Space after command names (DPC,MH)
relsize.sty 2013/03/29 ver 4.1
```

related algorithm2e-command-algorithm-already-defined

Add algo2e to the usepackage command like the following:

\usepackage[algo2e]{algorithm2e}

October 20, 2019 03:07 AM

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