reduce border line on algorithm in LaTex

Question

I am trying to include a centered algorithm in a single column latex document on overleaf, however as can be seen from the picture, the border requires to be shortend in width to look and fit the page better.

How can I reduce the width of the top and bottom lines, so that they only cover the text, but remain centered on the page

\documentclass{article}
\usepackage[tmargin=1.25in,bmargin=1.25in,lmargin=1.5in,rmargin=1.5in]{geometry}
\usepackage{fancyhdr}


\usepackage[fleqn]{amsmath}
\usepackage{algorithm}
\usepackage{algpseudocode}

\usepackage{apacite}



\begin{document}
\fontfamily{ptm}\selectfont
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\rhead{\large{\textit{header
}}}
\rfoot{Copyright $\textcopyright$ 2018+}
\cfoot{}
\sffamily
\noindent\rule{14cm}{1pt}
\begin{center}
\huge{\textbf{Title}}
\end{center}
\vspace{-\baselineskip}
\noindent\rule{14cm}{1pt}
\fontfamily{ptm}\selectfont
\begin{flushleft}
\vspace{7mm}
\par
\large{\textbf{authors}}
\vspace{5mm}
\par
\large{\textit{School}}
\par
\large{\textit{No emails (please)}}
\vspace{7mm}
\par
\renewcommand{\sfdefault}{\large{\textbf{ABSTRACT}}}
\sfdefault
\par
\fontfamily{ptm}\selectfont
abstract. 
\vspace{5mm}
\par 
\textit{Keyword:} 
\par  
\vspace{5mm}
\noindent\rule{14cm}{1pt}
\vspace{5mm}
\par



\renewcommand{\sfdefault}{\large{\textbf{1 \quad \quad INTRODUCTION}}}
\sfdefault
\par
\fontfamily{ptm}\selectfont
Describe the general perspective of the chapter. Toward the end, specifically state the objectives of the chapter. 
\vspace{7mm}
\par
\renewcommand{\sfdefault}{\large{\textbf{BACKGROUND (SUBHEAD STYLE 1- ARIAL, SIZE 12, BOLD)}}}
\sfdefault
\par
\fontfamily{ptm}\selectfont
Provide broad definitions and discussions of the topic and incorporate views of others (literature review) into the discussion to support, refute or demonstrate your position on the topic.
\vspace{7mm}
\par
\renewcommand{\sfdefault}{\large{\textbf{MAIN FOCUS OF THE CHAPTER}}}
\sfdefault
\vspace{7mm}
\par
\cite{TEIXEIRA2017}




\begin{algorithm}
    \centering
    \caption{title}\label{algorithm}
    \begin{algorithmic}[1]
        \State \text{algorithm} 
        \Repeat
        \State \text{/*Parse data to format*/}
        \For{$i\gets 1, rows$}
        \State $\text{algorithm}$ 
        \State $\text{Pad data arrays with 0s}$ 
        \EndFor
        \Until {Data is converted}
        \State \text{algorithm}
        \Repeat
        \State \text{algorithm}
        \For{$i\gets 1, rows$}
        \State $\text{algorithm}$ 
        \EndFor
        \Until {algorithm}
        \State \textbf{Return}  \text{algorithm}
    \end{algorithmic}
\end{algorithm}


\renewcommand{\sfdefault}{\large{\textbf{2 \quad \quad INTRODUCTION2}}}
\sfdefault

\end{flushleft}

\renewcommand{\sfdefault}{\large{\textbf{2 \quad \quad REFERENCE}}}
\sfdefault
\bibliographystyle{apacite}
\bibliography{sa.bib}



\end{document}

Answer 1

A possible approach is to put the algorithm environment in a minipage environment, as in Putting algorithm in minipage. The minipage allows to specify the width, for example 0.5\textwidth.

Note that algorithm is a floating environment, therefore it cannot be used in a minipage directly, but only when floating is disabled with the [H] argument (i.e., [H]ere).

To center the algorithm on the page you can put it in a center environment.

MWE:

\documentclass{article}
\usepackage{fancyhdr}

\usepackage{amsmath}
\usepackage{algorithm}
\usepackage{algpseudocode}


\begin{document}
\pagestyle{fancy}
\rhead{\textit{header}}

\begin{center}
\begin{minipage}{0.5\textwidth}
\begin{algorithm}[H]
    \centering
    \caption{title}\label{algorithm}
    \begin{algorithmic}[1]
        \State \text{algorithm} 
        \Repeat
        \State \text{/*Parse data to format*/}
        \Until {Data is converted}
    \end{algorithmic}
\end{algorithm}
\end{minipage}
\end{center}

\end{document}

Result:

Answer 2

If you wish to limit the width of the algorithm, your easiest option is to place it in a minipage using a pre-specified width and place it inside a center environment (using the [H] float specifier for the algorithm environment. You can still make it float by placing the entire construction inside a figure, if you wish

\begin{figure}
  \centering
  \begin{minipage}{<width>}
    \begin{algorithm}[H]
      <your algorithm>
    \end{algorithm}
  \end{minipage}
\end{figure}

The \caption within the algorithm would work as expected, using only the figure environment as a floating mechanism.

If you want to find the true (natural) width of the algorithm, you can use varwidth's similarly-named environment varwidth to capture the width of the algorithmic environment contents:

\documentclass{article}

\usepackage{algorithm}
\usepackage{algpseudocode}

\usepackage{varwidth}
\usepackage{lipsum}

\newsavebox{\algbox}
\algrenewcommand{\Return}{\State \textbf{return}~}

\begin{document}

% Capture the algorithm pseudo-code inside a box; maximum width will be \linewidth
\begin{lrbox}{\algbox}
  \begin{varwidth}{\linewidth}
    \begin{algorithmic}[1]
      \State algorithm
      \Repeat
        \State /*Parse data to format*/
        \For{$i \gets 1, rows$}
          \State algorithm
          \State Pad data arrays with 0s
        \EndFor
      \Until Data is converted
      \State algorithm
      \Repeat
        \State algorithm
        \For{$i \gets 1, rows$}
          \State algorithm
        \EndFor
      \Until algorithm
      \Return algorithm
    \end{algorithmic}
  \end{varwidth}
\end{lrbox}

\lipsum[1]

\begin{center}% Or use a figure environment and \centering
  \begin{minipage}{\wd\algbox}
    \begin{algorithm}[H]
      \caption{Algorithm title}
      \usebox{\algbox}% Use algorithm pseudo-code box
    \end{algorithm}
  \end{minipage}
\end{center}

\lipsum[2]

\end{document}