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I am a beginner in writing algorithm in LaTeX using algorithm2e. I am trying to write a simple algorithm (code is attached herewith). However, I am not getting correct output. I want to see line numbers. The output is also attached herewith.

Please note that i included the following command in LaTeX preamble too see line numbers

\usepackage[linesnumbered,lined,boxed,commentsnumbered]{algorithm2e}

There must be something wrong in my code. Is there anyone who can help me execute it correctly?

Output produced

\begin{algorithm} [H]
\caption{QL algorithm}
Initialize Q-table values (Q(s, a)) arbitrarily\
Initialize a state(s_t)\
Repeat Step 4 to 6 until learning period ends\
Choose an action (a_t) for the current state (s_t) using an exploratory policy\
Take action (a_t) and observe the new state (s_t+1) and reward (r_t+1)\
Update Q-value\
\end{algorithm}
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    Welcome to TeX.SE! Please extend your code fragment to complete small document, which begin with \documentclass and end with \end{document} Commented Dec 23, 2019 at 1:36
  • 1
    The problem might only come from the subscripts, which should probably be in math mode. Commented Dec 23, 2019 at 2:44

1 Answer 1

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This is how you would set things up using algorithm2e. Specifically, you need line-ends to be denoted by \;. Also consider using labels (\nllabel) and that you can \reference.

enter image description here

\documentclass{article}

\usepackage[linesnumbered,lined,boxed,commentsnumbered]{algorithm2e}

\begin{document}

\begin{algorithm}
  \caption{QL algorithm}
  Initialize $Q$-table values $(Q(s, a))$ arbitrarily\;
  Initialize a state $(s_t)$\;
  Repeat Steps~\ref{alg:step_4} to~\ref{alg:step_6} until learning period ends\;
  Choose an action $(a_t)$ for the current state $(s_t)$ using an exploratory policy\; \nllabel{alg:step_4}
  Take action $(a_t)$ and observe the new state $(s_t + 1)$ and reward $(r_t + 1)$\;
  Update $Q$-value\; \nllabel{alg:step_6}
\end{algorithm}

\end{document}
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