How to encircle the targeted item in table?

Question

I am using this preamble of LaTeX

\documentclass[10pt]{book}
\usepackage[paperheight=9.5in,paperwidth=8in, top=1in, bottom=0.8in, twocolumn]{geometry}
\setlength{\columnseprule}{0.4pt}
\usepackage{amssymb,amsfonts}
\usepackage{mathrsfs}
\usepackage[centertags]{amsmath}
\usepackage{amsthm}
\usepackage{amsmath}
\newtheorem{theorem}{Theorem}
\usepackage{epsfig}
\usepackage{float}
\usepackage{graphicx}\graphicspath{{Graphics/}}
\usepackage{mathptmx}
\usepackage[square,sort&compress]{natbib}
\usepackage{pgf,tikz,pgfplots}
\pgfplotsset{compat=1.15}
\usetikzlibrary{arrows}
\usepackage[T1]{fontenc}
\usepackage{fancyhdr}\pagestyle{fancy}
\usepackage{xcolor}
\usepackage{setspace}
\usepackage{booktabs}
\usepackage{enumitem}
\setlist[enumerate,2]{label=(\roman*).}
\usepackage{tasks}
\settasks{label=$\circ$}
%\usepackage{hyperref}
\usetikzlibrary{arrows.meta}
\renewcommand{\baselinestretch}{1.5}
\newcommand\aug{\fboxsep=-\fboxrule!!!\fbox{\strut}!!!}
\theoremstyle{definition}
\newtheorem{Thm}{Theorem}[section]
\newtheorem{lem}[Thm]{Lemma}
\newtheorem{pro}[Thm]{Proposition}
\newtheorem{de}[Thm]{Definition}
\newtheorem{re}[Thm]{Remark}
\newtheorem{ex}[Thm]{Example}
\newtheorem{cor}[Thm]{Corollary}
\numberwithin{equation}{section}
\definecolor{uuuuuu}{rgb}{0.26666666666666666,0.26666666666666666,0.26666666666666666}
\begin{document}
\begin{tabular}{|c|c|c|}\hline
        \text{item}\quad$x$&\text{Frequency}$f$&$c.f$\\hline
        10&1&1\
        12&10&11\
        15&5&16\
        20&13&29\
        25&2&31\
        30&4&35\\hline
    \end{tabular}
\end{document}

I don't know how to encircle the targeted item as shown in the picture below.

See https://tex.stackexchange.com/questions/489942/beamer-shading-columns-and-highlight-extra, if can help you. — Zarko, Aug 27 '23 at 04:19

Zarko · Accepted Answer · 2023-08-27T13:55:30.217

With help of tikzmark library:

\documentclass[10pt]{book}
\usepackage[paperheight=9.5in,paperwidth=8in, 
            top=1in, bottom=0.8in, twocolumn]{geometry}
\setlength{\columnseprule}{0.4pt}
\usepackage{tikz}
\usetikzlibrary{fit,            % new
                tikzmark}       % new
\tikzset{FIT/.style = {%
    draw=red, thick, inner sep=2pt, rounded corners, fit=#1,
    node contents={}},
           s/.style= {inner xsep=6pt}
        }
\begin{document}
\begin{tabular}{|c|c|c|}
    \hline
item    \quad$x$
    &   Frequency   $f$
            &   $c.f$   \
    \hline
10  & 1     & 1     \
12  & 10    & 11    \
15  & 5     & 16    \
\tikzmarknode[s]{a}{20}
    & 13    & \tikzmarknode[s]{b}{29} \
25  & 2     & 31    \
30  & 4     & 35    \
    \hline
    \end{tabular}
    \begin{tikzpicture}[overlay,remember picture]
\node[FIT=(a) (b)];
    \end{tikzpicture}
\end{document}

or with use ellipse for encircling target items in table:

\documentclass[10pt]{book}
\usepackage[paperheight=9.5in,paperwidth=8in, 
            top=1in, bottom=0.8in, twocolumn]{geometry}
\setlength{\columnseprule}{0.4pt}
\usepackage{tikz}
\usetikzlibrary{fit,                % new
                tikzmark,
                shapes.geometric}   % new
\tikzset{FIT/.style args = {#1/#2}%
    {ellipse, draw=red, thick, inner xsep=#1, inner ysep=2pt, fit=#2,
     node contents={}},
        }
\usepackage{array}
\begin{document}
\begin{table}[ht]
\centering
\renewcommand\arraystretch{1.2}
\begin{tabular}{|w{c}{4em}|c|w{c}{4em}|}
    \hline
item    \quad$x$
    &   Frequency   $f$
            &   $c.f$   \
    \hline
10  & 1     & 1     \
12  & 10    & 11    \
15  & 5     & 16    \
\tikzmarknode{a}{20}
    & 13    & \tikzmarknode{b}{29} \
25  & 2     & 31    \
30  & 4     & 35    \
    \hline
    \end{tabular}
    \begin{tikzpicture}[overlay,remember picture]
\node[FIT=-9pt/{(a) (b)}];
    \end{tikzpicture}
\end{table}
\end{document}

For final looks of table you need to compile of code at least three times. — Zarko, Aug 27 '23 at 04:56

score 4 · Answer 2 · answered Aug 27 '23 at 07:49

Here is a solution with {NiceTabular} of nicematrix.

\documentclass[10pt]{book}
\usepackage[paperheight=9.5in,paperwidth=8in, 
            top=1in, bottom=0.8in, twocolumn]{geometry}
\setlength{\columnseprule}{0.4pt}
\usepackage{nicematrix,tikz}
\usetikzlibrary{fit}
\begin{document}
\begin{NiceTabular}{ccc}[vlines]
  \hline
  item\quad $x$ & Frequency $f$ & $c.f$ \
  \hline
  10  & 1  & 1   \
  12  & 10 & 11  \
  15  & 5  & 16  \
  20  & 13 & 29  \
  25  & 2  & 31  \
  30  & 4  & 35  \
  \hline
\CodeAfter
  \tikz \node [ draw = red, rounded corners, fit = (5-1) (5-3) ] { } ; 
\end{NiceTabular}
\end{document}

How to encircle the targeted item in table?

2 Answers2