2

I wanted to make picture looks like this.

enter image description here

What I have done so far,

\documenclass[a4paper]{article}
\begin{document}
$$
\underbrace{2\quad 4\quad 6\quad 6}_{\textrm{empat nilai}} \quad \underset{Q_2}{7}  \quad  \underbrace{9\quad 9\quad 11\quad 12}_{\textrm{empat nilai}}
$$
\end{document}

the output

enter image description here

I want to add vertical arrow pointing the number for Q1, Q2 or Q3. How can I do that?

3

You can do that with \substack.

Unrelated: don't use $$ … $$ for displayed equation in LaTeX: – this is a plain TeX construct, and it can result in a bad vertical spacing. Use \[ … \] instead.

\documentclass[a4paper]{article}
\usepackage{amsmath}

\begin{document}

\[
  \underbrace{2\quad 4\quad 6\quad 6}_{\textrm{empat nilai}} \quad \underset{\substack{\uparrow\\Q_2}}{7} \quad \underbrace{9\quad 9\quad 11\quad 12}_{\textrm{empat nilai}}
\]

\end{document} 

enter image description here

3

I would just draw the whole thing with TikZ rather than messing around with arrows from some fonts.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc,chains,decorations.pathreplacing,calligraphy}
\begin{document}
\[
 \begin{tikzpicture}[decoration={calligraphic brace,mirror,raise=0.5ex}]
  \path[start chain=A going right,node distance=1em]
   foreach \x in {2,4,6,6,7,9,9,11,12}{node[on chain]{$\x$}};
  \draw[decorate,thick] (A-1.south west) -- node[below=1ex] {empat nilai}
    (A-4.south east); 
  \draw[decorate,thick] (A-6.south west) -- node[below=1ex] {empat nilai}
    (A-9.south east); 
  \draw[latex-] (A-5.south) -- ++ (0,-1em) node[below]{$Q_2$};  
 \end{tikzpicture}
\]

\[
 \begin{tikzpicture}[decoration={calligraphic brace,mirror,raise=0.5ex}]
  \path[start chain=A going right,node distance=1em]
   foreach \x in {2,4,6,6,7,9,9,11,12}{node[on chain]{$\x$}};
  \foreach \x in {1,3,6,8} 
  {\draw[decorate,thick] (A-\x.south west) --   (A-\the\numexpr\x+1\relax.south east); }
  \draw[latex-] ($(A-2.south)!0.5!(A-3.south)$) -- ++ (0,-1em) node[below]{$Q_1$};  
  \draw[latex-] (A-5.south) -- ++ (0,-1em) node[below]{$Q_2$};  
  \draw[latex-] ($(A-7.south)!0.5!(A-8.south)$) -- ++ (0,-1em) node[below]{$Q_3$};  
 \end{tikzpicture}
\]

\end{document}

enter image description here

2

With a friendly syntax (but unfriendly code, but, hey, it works!).

\documentclass{article}
\usepackage{amsmath}

\ExplSyntaxOn

\NewDocumentCommand{\quartils}{ O{1em} m }
 {
  \group_begin:
  \masrosid_quartil:nn { #1 } { #2 }
  \group_end:
 }

\NewDocumentCommand{\quartilD}{ o m }
 {
  \masrosid_quartil_D:nn { #1 } { #2 }
 }
\NewDocumentCommand{\quartilQ}{ m m }
 {
  \masrosid_quartil_Q:nn { #1 } { #2 }
 }

\dim_new:N \l__masrosid_quartil_sep_dim

\cs_new_protected:Nn \masrosid_quartil:nn
 {
  \cs_set_eq:NN \D \quartilD
  \cs_set_eq:NN \Q \quartilQ
  \dim_set:Nn \l__masrosid_quartil_sep_dim { #1 }
  #2
 }

\cs_new_protected:Nn \masrosid_quartil_D:nn
 {
  {
   \underbrace
    {
     \seq_set_from_clist:Nn \l_tmpa_seq { #2 }
     \seq_use:Nn \l_tmpa_seq { \skip_horizontal:N \l__masrosid_quartil_sep_dim }
    }
    \tl_if_novalue:nF { #1 } { \sb{\textup{#1}} }
   }
 }

\cs_new_protected:Nn \masrosid_quartil_Q:nn
 {
  \underset{ \substack { \big\uparrow \\ Q\sb{#1}\mathstrut } }
   {
    \tl_if_blank:nTF { #2 }
     { \skip_horizontal:N \l__masrosid_quartil_sep_dim }
     {
      \skip_horizontal:N \l__masrosid_quartil_sep_dim
      #2
      \skip_horizontal:N \l__masrosid_quartil_sep_dim
     }
   }
 }

\ExplSyntaxOff

\begin{document}

\[
\quartils{ \D[empat nilai]{2,4,6,6} \Q{2}{7} \D[empat nilai]{9,9,11,12} }
\]

\[
\quartils{ \D{2,4} \Q{1}{} \D{6,6} \Q{2}{7} \D{9,9} \Q{3}{} \D{11,12} }
\]

\end{document}

The parts to be underbraced are given as arguments to \D (for “data”), with an optional argument for the explanatory text. The quartils are denoted by \Q, where the first argument is the quartil number, whereas the second argument is the data (if empty, the spacing will be right).

enter image description here

The command \quartils also accepts an optional argument, default 1em, for the spacing between entries. If you call

\quartils[2em]{ \D{2,4} \Q{1}{} \D{6,6} \Q{2}{7} \D{9,9} \Q{3}{} \D{11,12} }

the output would be

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.