[Tex/LaTex] how to change the algorithm environment

algorithms

I am interested in changing the algorithm environment so that the numbered "Algorithm" title appears at the bottom instead of at the top, and also the three rulers (one above the Algorithm caption, second below the Algorithm caption, and third at the bottom of the whole environment) won't be there.

I couldn't find a way of doing it according to here:

http://cs.brown.edu/about/system/software/latex/doc/algodoc.pdf

Any ideas how to do that?

(Maybe I should define a new environment which is very similar to the Figure environment instead, only the heading is Algorithm instead of Figure?)

Best Answer

The package algorithm accepts three options at loading time, in regards of the appearance of the algorithm: ruled, boxed and plain. The default is ruled but I think you are looking for the plain style.

Example in plain style:

\documentclass{article}
\usepackage[plain]{algorithm}
\usepackage{algorithmic}

\begin{document}
\begin{algorithm}
\begin{algorithmic}
\FOR{$i=1 \to 10$}
    \STATE X
\ENDFOR
\end{algorithmic}
\caption{My algorithm}
\end{algorithm}
\end{document}

Output:

enter image description here

Substituting plain with boxed:

enter image description here

And finally the default style (ruled):

enter image description here

Related Solutions

[Tex/LaTex] How to remove/change the vertical spacing before and after an ‘algorithm’ environment

LaTeX has three length variables to control (i) the distance between two adjacent floating objects (such as figure, table, or algorithm objects), (ii) the distance between a float at the top (bottom) of a page and the text below (above) it, and (iii) the distance between an in-text float and the text above and below it; they are called \floatsep, \textfloatsep, and \intextsep, respectively. (LaTeX also has three more such variables to control the spacing above and/or below floats on floats-only pages; these are \@fptop, \@fpbot, and \@fpsep, respectively.)

To completely suppress the in-text separation of a float (not recommended, by the way!!), you'd type (in the preamble)

\setlength{\intextsep}{0pt}

i.e., you'd set \intextsep to a fixed length of 0 points. A better solution, if you're pressed for space (pun intended), would be to set

\setlength{\intextsep}{1\baselineskip}

Here's a MWE that uses the algorithm2e package:

\documentclass{article}
\usepackage{algorithm2e}
\newcommand{\lipsone}{Lorem ipsum dolor sit amet, consectetuer 
adipiscing elit. Ut purus elit, vestibulum ut, placerat ac, 
adipiscing vitae, felis.}
\newcommand{\lipstwo}{Donec vehicula augue eu neque. Pellentesque 
habitant morbi tristique senectus et netus et malesuada fames ac 
turpis egestas.}
\begin{document}

\subsubsection*{With default setting of \texttt{\textbackslash intextsep}} 
\lipsone

\begin{algorithm}
\caption{A random example}
\SetAlgoLined
\KwData{Some input}[h]
\KwResult{Some output}
initialization\;
\While{not at end of this document}{read}
{go back to beginning\;}
\end{algorithm}

\lipstwo


\subsubsection*{After setting \texttt{\textbackslash intextsep} to 0pt}
\setlength{\intextsep}{0pt} 
\lipsone

\begin{algorithm}
\caption{Another random example}
\SetAlgoLined
\KwData{Some input}
\KwResult{Some output}
initialization\;
\While{not at end of this document}{read}
{go back to beginning\;}
\end{algorithm}

\lipstwo

\end{document}

[Tex/LaTex] Slight change in algorithm

Here's an option that provides feasible output. I've removed the physical numbering in the caption:

enter image description here

\documentclass[10pt,twocolumn]{article}
\usepackage{algorithm,algpseudocode}% http://ctan.org/pkg/{algorithms,algorithmx}
\algnewcommand{\Inputs}[1]{%
  \State \textbf{Inputs:}
  \Statex \hspace*{\algorithmicindent}\parbox[t]{.8\linewidth}{\raggedright #1}
}
\algnewcommand{\Initialize}[1]{%
  \State \textbf{Initialize:}
  \Statex \hspace*{\algorithmicindent}\parbox[t]{.8\linewidth}{\raggedright #1}
}

\begin{document}
\begin{algorithm}
  \caption{Boosted $K$ Nearest Neighbour}
  \begin{algorithmic}[1]
    \Inputs{$S={s_i}=\left(x_i,y_i\right)$}
    \Initialize{\strut$w_i^0 \gets 0$, $i=1,\ldots,n$ \\ $S_0 \gets S$}
    \For{t = 1 to T}
      \State $S_t \gets S_{t-1}$
      \For{$s_q \in S_t$}
        \State $N_q \gets$ k nearest neighbors 
        \State of $s_q$ using $D(s_q,s_i)$
        \State label($s_q$)$=argmax\sum_{s_i \in N_q}D(s_q,s_i)$;
        \If{label($s_q$)$\ne y_q$}
          \For{$s_i \in N_i$}
            \If{$y_i \ne y_q$}
              \State $w_{i}^{t} \gets w_{i}^{t} - \lambda/d(x_q,x_i)$;
            \Else
              \State $w_{i}^{t} \gets w_{i}^{t} + \lambda/d(x_q,x_i)$;
            \EndIf
          \EndFor
        \EndIf
      \EndFor
      \If{label($s_q$)$=y_q \forall_{s_q}$}
        \State break
      \EndIf
    \EndFor
  \end{algorithmic}
\end{algorithm}
\end{document}

A newly-defined \Inputs and (equivalent) \Initialize takes one argument that sets its contents in a \Statex with an indent of \algorithmicindent - the default - to align with the other algorithm elements. The contents is stored in a top-aligned \parbox that fits across 80% of the line. I'm sure you won't need more, but in case you do, that can also be fixed to not cause overfull boxes.

Best Answer

Related Solutions

[Tex/LaTex] How to remove/change the vertical spacing before and after an ‘algorithm’ environment

[Tex/LaTex] Slight change in algorithm

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