3

How can I write 'begin' and 'end' statement at the top and bottom the following code like this?A sample pseuodcode with begin and end statement

Besides using algorithm and algopseudocode package I can write Require and Ensure statement. Those are not properly aligned. Is there any way to align like the attached pic?

    % book example for classicthesis.sty
\documentclass[
  % Replace twoside with oneside if you are printing your thesis on a single side
  % of the paper, or for viewing on screen.
  %oneside,
  twoside,
  11pt, a4paper,
  footinclude=true,
  headinclude=true,
  cleardoublepage=empty
]{scrbook}

\usepackage{lipsum}
\usepackage[linedheaders,parts,pdfspacing]{classicthesis}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{acronym}
\usepackage{algpseudocode}
\usepackage{algorithm}



\begin{document}

\chapter{A Chapter}
\begin{algorithm}
\caption{Apriori algorithm}

\begin{algorithmic}[1]

    \State $L_{1} \leftarrow Frequent 1-itemset $
    \State $k \leftarrow 2$
    \While{$L_{k-1} \neq \phi$}
    \State $Temp \leftarrow candidateItemSet (L_{k-1})$
    \State $C_{k} \leftarrow frequencyOfItemSet (Temp)$
    \State $L_{k} \leftarrow compareItemSetWithMinimumSupport (C_{k}, minsup) $
    \State $k \leftarrow k + 1$
    \EndWhile\\
    \Return L

\end{algorithmic}
\end{algorithm}

\end{document}

Here is the online code

  • Welcome to TeX.SX! Please add a minimal working example (MWE) starting with \documentclass{...} and ending with \end{document} so that users willing to help will have a starting point without the need of additional setup. – Pier Paolo Jan 19 '15 at 17:41
  • I think this will just be a matter of making your own block, as in algorithmicx section 4.2. Something like \algblock[name]{begin}{end} with \begin and \end statements as needed. – Mike Renfro Jan 19 '15 at 18:01
  • @MikeRenfro \begin and \end are already defined... You can not use them. – karlkoeller Jan 19 '15 at 21:26
  • Correct. My mistake. – Mike Renfro Jan 19 '15 at 21:27
4

Just define (in algpseudocode style)

\algdef{SE}{Begin}{End}{\textbf{begin}}{\textbf{end}}

and then use \Begin and \End as in the following example:

    % book example for classicthesis.sty
\documentclass[
  % Replace twoside with oneside if you are printing your thesis on a single side
  % of the paper, or for viewing on screen.
  %oneside,
  twoside,
  11pt, a4paper,
  footinclude=true,
  headinclude=true,
  cleardoublepage=empty
]{scrbook}

\usepackage{lipsum}
\usepackage[linedheaders,parts,pdfspacing]{classicthesis}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{acronym}
\usepackage{algpseudocode}
\usepackage{algorithm}

\algdef{SE}{Begin}{End}{\textbf{begin}}{\textbf{end}}

\begin{document}

\chapter{A Chapter} 
\begin{algorithm}
\caption{Apriori algorithm}

\begin{algorithmic}[1]
    \Begin
    \State $L_{1} \leftarrow Frequent 1-itemset $
    \State $k \leftarrow 2$
    \While {$L_{k-1} \neq \phi$}
    \State $Temp \leftarrow candidateItemSet (L_{k-1})$
    \State $C_{k} \leftarrow frequencyOfItemSet (Temp)$
    \State $L_{k} \leftarrow compareItemSetWithMinimumSupport (C_{k}, minsup) $
    \State $k \leftarrow k + 1$
    \EndWhile
    \State \Return L
    \End
\end{algorithmic}
\end{algorithm}

\end{document} 

Output

enter image description here

Just a remark. You should not write

\EndWhile\\
\Return L

but

\EndWhile
\State \Return L

as in my example.


If you want a different indentation for \Return you can do the following.

Add

\def\BState{\State\hskip-.5em}

in the preamble and use \BState instead of \State in front of \Return.

MWE

    % book example for classicthesis.sty
\documentclass[
  % Replace twoside with oneside if you are printing your thesis on a single side
  % of the paper, or for viewing on screen.
  %oneside,
  twoside,
  11pt, a4paper,
  footinclude=true,
  headinclude=true,
  cleardoublepage=empty
]{scrbook}

\usepackage{lipsum}
\usepackage[linedheaders,parts,pdfspacing]{classicthesis}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{acronym}
\usepackage{algpseudocode}
\usepackage{algorithm}

\algdef{SE}{Begin}{End}{\textbf{begin}}{\textbf{end}}
\def\BState{\State\hskip-.5em}

\begin{document}

\chapter{A Chapter} 
\begin{algorithm}
\caption{Apriori algorithm}

\begin{algorithmic}[1]
    \Begin
    \State $L_{1} \leftarrow Frequent 1-itemset $
    \State $k \leftarrow 2$
    \While {$L_{k-1} \neq \phi$}
    \State $Temp \leftarrow candidateItemSet (L_{k-1})$
    \State $C_{k} \leftarrow frequencyOfItemSet (Temp)$
    \State $L_{k} \leftarrow compareItemSetWithMinimumSupport (C_{k}, minsup) $
    \State $k \leftarrow k + 1$
    \EndWhile
    \BState \Return L
    \End
\end{algorithmic}
\end{algorithm}

\end{document}

Output

enter image description here

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.