How can I represent a math formula as a figure?

Question

I want to represent a math formula as an figure instead of an equation.

My code:

\documentclass{article}
\usepackage{mathtools}% Loads amsmath
\begin{document}
\begin{equation}
    \underbrace{x\ .\ y}_\text{$S_{v}$}.
    \underbrace{z}_\text{(e)}
\end{equation}
\end{document}

wanted output:

Put $\underbrace{x\cdot y}_{S_{v}} \cdot \underbrace{z}_\text{(e)}$ inside a figure environment with a centering and a \caption{} . — Sigur, Jan 22 '24 at 20:02
If your next question is "How do I get my equation figure to go where I want it", then see https://tex.stackexchange.com/a/8631/107497 — Teepeemm, Jan 22 '24 at 21:22
You can get rid of the figure number with https://tex.stackexchange.com/a/339136/5283 . — Simd, Jan 23 '24 at 12:12

score 6 · Accepted Answer · answered Jan 22 '24 at 21:03

Despite the name, the figure environment can contain anything.

For instance an equation, a picture, some text, whatever.

\documentclass{article}
\usepackage{mathtools}% Loads amsmath
\usepackage{lipsum}
\begin{document}
\lipsum[1][1-4]
\begin{figure}[htp]
[
    \underbrace{x\cdot y}{S{v}\mathstrut}\cdot
    \underbrace{z\vphantom{y}}_{(\mathrm{e)}}
]
\caption{My interesting equation}\label{mie}
\end{figure}
\lipsum[2]
\end{document}

Note the typesetting: multiplication is never a period; using \text{$...$} is very redundant.

Sebastiano · Answer 2 · 2024-01-22T20:06:11.863

2

\documentclass[12pt]{article}
\usepackage{mathtools}
\usepackage{caption}

\DeclareCaptionType{figformula}[Figure][]
\begin{document}
\begin{figformula}[h]
  \begin{equation*}
   \underbrace{x\ .\ y}_\text{$S_{v}$}.
    \underbrace{z}_\text{(e)}
  \end{equation*}
\caption{My math formula.}
\end{figformula}

\end{document}

edited Jan 22 '24 at 20:06

answered Jan 22 '24 at 20:02

Sebastiano

54,118

Can we remove the (1) at the right hand side? – alper Jan 22 '24 at 20:03
@alper Sorry I have not seen this. – Sebastiano Jan 22 '24 at 20:05
Its caption number always starts from 1 even there is another figures beforehand is it normal? – alper Jan 22 '24 at 20:09
@alper I think yes. – Sebastiano Jan 22 '24 at 20:11
2

That can be modified, with \setcounter{equation}{#} just before equation's environment. Example if #=2 the number equation will be #original+2 – Darío Jan 22 '24 at 20:40
3

@alper Sebastiano has declared a new float sequence so figformula is a third float type with its own counter just like table and figure have separate numbers. If you want equations in the same sequence as figures just use figure – David Carlisle Jan 22 '24 at 22:05

score 1 · Answer 3 · answered Jan 22 '24 at 20:26

Using figure's environment:

\documentclass{article}
\usepackage{mathtools}% Loads amsmath
\begin{document}
\begin{figure}
\begin{equation}
    \underbrace{x\ .\ y}_\text{$S_{v}$}.
    \underbrace{z}_\text{(e)}\nonumber
\end{equation}
\caption{Like show in the figure}
\end{figure}
\end{document}

How can I represent a math formula as a figure?

3 Answers3