Math & Science ⇒ Circling text in \underbrace mode

[feryee]

Hi,
I am trying to circle a text under my math equation. I used \tikz and \circled but it didn't work. Can you please help me as how to circle a text while using \underbrace. thanks

[Stefan Kottwitz]

Hi feryee,

welcome to the forum!

i used \tikz and \circled but it didn't work.

What did you try? We could improve or fix it. TikZ is usually fine for this.

can you please help me as how to circle a text while using underbrace.

Sure! In an abstract theoretical way? Or show simply your text sample with your approach so we could work on this.

Stefan

[feryee]

Thank you very much for your time.Below here you may see my sample code.

Code: Select all

\begin{eqnarray}
\gamma E\Bigg[\underbrace{\bigg(\textbf{x}(k)\textbf{x}^T(k)\otimes \textbf{I})vec\left(\boldsymbol\delta(k)\boldsymbol\delta^T(k)\right)\bigg)\left(\sum\limits_{i=0}^{k-2}\alpha^i e^2(k-i-1)\right)}_\text{1}\Bigg]
\end{eqnarray}

I'm trying to to circle 1 instead of having simple text 1 under my equation(i.e _\text{circle 1})
thanks

[Stefan Kottwitz]

The simplest way would be _{\textcircled{1} as here:

Code: Select all

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
  \gamma E\Bigg[\underbrace{\bigg(\textbf{x}(k)\textbf{x}^T(k)\otimes
  \textbf{I})vec\left(\boldsymbol\delta(k)\boldsymbol
  \delta^T(k)\right)\bigg)\left(\sum\limits_{i=0}^{k-2}\alpha^i e^2(k-
  i-1)\right)}_{\textcircled{1}}\Bigg]
\end{equation}
\end{document}

It looks nice with TikZ, I created a command \mycircle for this:

Code: Select all

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}
\newcommand{\mycircle}[1]{%
  \tikz[baseline]\node[draw,shape=circle,anchor=base,inner sep=0.4ex] {#1} ;}
\begin{document}
\begin{equation}
  \gamma E\Bigg[\underbrace{\bigg(\textbf{x}(k)\textbf{x}^T(k)\otimes 
  \textbf{I})vec\left(\boldsymbol\delta(k)\boldsymbol
  \delta^T(k)\right)\bigg)\left(\sum\limits_{i=0}^{k-2}\alpha^i e^2(k-
  i-1)\right)}_{\mycircle{1}}\Bigg]
\end{equation}
\end{document}

circled.png (8.22 KiB) Viewed 8722 times

Btw. never use eqnarray, better equation or align. For reasons, see eqnarray vs. align.

Stefan

[feryee]

Thank you very much indeed Stephen. The reason that i use \eqnarray is due to many terms of similar form exist. So, i would be not be practical to center all of such a terms.
Now, The first option worked fine. However, unfortunately my DVI viewer gives rendering error and the circle disappears.I took PS, but the problem stands.do you have any idea what this happens.
Thanks
Farhad

[Stefan Kottwitz]

Hi Farhad,

The reason that i use \eqnarray is due to many terms of similar form exist. So, i would be not be practical to center all of such a terms.

still, align, flalign or related environments would be better. And if there's no relation sign, as above, I would even use array for positioning math formula parts.

However, unfortunately my DVI viewer gives rendering error and the circle disappears.I took PS, but the problem stands.do you have any idea what this happens.

Today most people use pdfLaTeX, which produces PDF directly without the way over DVI or PS. I used it, and it worked fine with the circle.

Why do you use LaTeX in DVI mode?

Even though, TikZ should work with all drivers including producing DVI. Perhaps post a reduced minimal working example, which shows the problem.

Stefan

[feryee]

Stephen,
The main reason is EPS file. I have a EPS file and pdflatex fails to compile it. there is a way to get around with this issue.But, I just feel that reduces the quaility of eps file. Any suggestion?
Farhad

[Stefan Kottwitz]

Hi Farhad,

a modern TeX Live should easily work with EPS files also with pdfLaTeX. It can convert the images on the fly using the epstopdf script. I expect the quality to be the same, if PDF is the final result anyway, so there's the same kind of conversion necessary.

I don't know how MiKTeX handles it, but generally

Code: Select all

\usepackage{epstopdf}

plus enabling the shell-escape option should work.

Stefan

[feryee]

Thank you very much Stephen for your updates. I would like ask your help in drawing the following block diagram given throgh the address(System identification block at the beginning of the page):

http://zone.ni.com/reference/en-XX/help ... system_id/

aft_sysid.gif (3.99 KiB) Viewed 8663 times

would you please let me know the simplest method to get this block in the latex.
Thanks

[Stefan Kottwitz]

That's not so hard with TikZ. I did it for you, but please return the favor and later post also a drawing, which you may have made later on, so we would learn a bit.

If you got questions regarding how it was made, just ask.
Btw. please open a new topic for each new question, that's better to see than different topics at the end of earlier questions. I may split this topic later too. Just for keeping the forum well sorted. And further readers can see your new questions better as a new topic, so good for you.

Code: Select all

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes,positioning,quotes,arrows.meta}
\pgfdeclarelayer{bg}%   background layer
\pgfsetlayers{bg,main}% order of the layers
\tikzset{
  block/.style  = {draw, rectangle, align = center,
                   text width = 5em, fill = white},
  bullet/.style = {draw, circle, inner sep = 0.3ex,
                   fill = black},
  round/.style  = {draw, circle},
             >  = {Triangle[width = 1.5ex, length = 1.5ex]}
}
\usepackage{sfmath}
\renewcommand*{\familydefault}{\sfdefault}
\begin{document}
\begin{tikzpicture}
  \coordinate (start);
  \node (left)   [bullet, right = 3em of start]  {};
  \node (block1) [block,  right = 2em of left]   {Unknown System};
  \node (block2) [block,  below = 3em of block1] {Adaptive Filter};
  \node (sigma)  [round,  right = 5em of block1] {$\Sigma$};
  \node (right)  [bullet, right = 2em of sigma]  {};
  \node (stop)   [right = 3em of right]          {};
  \node [above left = -0.5em and -0.3 em of sigma] {$+$};
  \node [below left = -0.5em and -0.3 em of sigma] {$-$};
  \draw (start) edge ["$x(n)$", near start, ->] (block1);
  \draw (left) -- (left|-block2) edge[->] (block2);
  \draw (block2) to["$y(n)$", near end] (block2-|sigma) edge[->] (sigma);
  \draw (block1) edge["$d(n)$", ->] (sigma);
  \draw (sigma) edge["$e(n)$", near end, ->] (stop);
  \begin{pgfonlayer}{bg}% on background layer
    \draw (right) -- ++ (0em,-9em) -- ++ (-14.8em,0em)
                  -- ++ (0em,1em) edge[->] ++(5.5em,5.5em);
  \end{pgfonlayer}
\end{tikzpicture}
\end{document}

drawing.png (10.71 KiB) Viewed 8665 times

TikZ is great for natively creating high-quality drawings within LaTeX. Perhaps you have further use for it, such as for other diagrams.

Stefan