[Tex/LaTex] Indentation in the algorithm package after \Ensure, \Require

algorithmicxindentation

I have this piece of code:

\documentclass[11pt]{article}
\usepackage{algorithm}
\usepackage{algpseudocode}
\usepackage{varwidth}

\begin{document}

   \begin{algorithmic}
      \Require   \begin{varwidth}[t]{\linewidth}
                  A \par
                  AA  
               \end{varwidth}
      \Ensure      \begin{varwidth}[t]{\linewidth}
                  B \par
                  BB
               \end{varwidth}
   \end{algorithmic}

\end{document}

which yields

enter image description here

I would like the text which follows after \Ensure to be indented in such a way that it is placed right under the text which follows after \Require. How can this be done?

Best Answer

You can modify the definition of \Ensure to build a box as wide as Require:; you can do it globally or locally:

Global

\documentclass[11pt]{article}
\usepackage{algorithm}
\usepackage{algpseudocode}
\usepackage{varwidth}
\usepackage{calc} % for \widthof
\algrenewcommand\algorithmicensure{%
  \makebox[\widthof{\textbf{Require:}}][l]{\textbf{Ensure:}}}

\begin{document}

   \begin{algorithmic}
      \Require   \begin{varwidth}[t]{\linewidth}
                  A \par
                  AA\strut
               \end{varwidth}
      \Ensure      \begin{varwidth}[t]{\linewidth}
                  B \par
                  BB\strut
               \end{varwidth}
   \end{algorithmic}

\end{document}

Local

\documentclass[11pt]{article}
\usepackage{algorithm}
\usepackage{algpseudocode}
\usepackage{varwidth}
\usepackage{calc} % for \widthof

\begin{document}

   \begin{algorithmic}
   \algrenewcommand\algorithmicensure{%
     \makebox[\widthof{\textbf{Require:}}][l]{\textbf{Ensure:}}}
      \Require   \begin{varwidth}[t]{\linewidth}
                  A \par
                  AA\strut
               \end{varwidth}
      \Ensure      \begin{varwidth}[t]{\linewidth}
                  B \par
                  BB\strut
               \end{varwidth}
   \end{algorithmic}

\end{document}

Notice also the \strut at the end of varwidth to get an even vertical spacing.

enter image description here

Related Solutions

[Tex/LaTex] Not indent the first paragraph of a LaTeX document

Have you tried using the \noindent command in your definition of \maketitle?

Normally when you put \noindent at the beginning of a paragraph, it prevents that paragraph from being indented. It may or may not work for your purposes. (For all I know it might just use \@afterindentfalse internally)

[Tex/LaTex] Change Indentation Size in algorithmicx package

You can renew the internal command \algorithmicindent:

\algrenewcommand\algorithmicindent{2.0em}%

Change the 2.0em to whatever you wish.

Here is a MWE extracted from the documentation and adapted:

\documentclass{article}
\usepackage{algorithmicx}
\usepackage[ruled]{algorithm}
\usepackage{algpseudocode}
\usepackage{algpascal}
\usepackage{algc}
\newcommand{\euk}{Euclid}
\algrenewcommand\algorithmicindent{2.0em}%
\begin{document}
\begin{algorithmic}[1]
\algrenewcommand{\algorithmiccomment}[1]{\hskip3em$\rightarrow$ #1}
\State $x\gets x+1$\Comment{Here is the new comment}
\end{algorithmic}
\alglanguage{pseudocode}
\begin{algorithm}[H]
\caption{\euk's algorithm}\label{euclid}
\begin{algorithmic}[1]
\Procedure{\euk}{$a,b$}\Comment{The g.c.d. of a and b}
   \State $r\gets a\bmod b$
   \While{$r\not=0$}\Comment{We have the answer if r is 0}
      \State $a\gets b$
      \State $b\gets r$
      \State $r\gets a\bmod b$
   \EndWhile\label{euclidendwhile}
   \State \Return $b$\Comment{The gcd is b}
\EndProcedure
\end{algorithmic}
\end{algorithm}
\end{document}