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enter image description here

I’m still a beginner to LaTeX, and I don’t know how to write this equation.

  • 2
    Welcome to TeX.SE! Did you read an introduction to LaTeX? Please show us what you have tried so far ... – Kurt Jan 13 at 3:37
  • 8
    Isn't this the same question you asked a day ago? Please advise if this impression is incorrect. – Mico Jan 13 at 3:42
  • To write equations simply the easiest way is to use LyX because it allows you to view the rendering live. Watch this very short video: How to use mathematical formula editor in LYX - LaTeX Home page of Lyx LyX – The Document Processor – AndréC Jan 13 at 8:13
2

enter image description here

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\[
  \mathrm{ASD}(P_{\text{ref}}, P_{\text{auto}}) = 
    \frac{1}{\lvert P_{\text{ref}} \rvert}
    \sum_{p \in P_{\text{ref}}} d(p, P_{\text{auto}})
\]

\end{document}
3

This is an expanded version of @Werner's answer.


Welcome to TeX.SE!

I can see that you are in a great hurry, so I decide to post an answer here (in additional with an upvote). However, you just have to spend about 15 minutes reading and practicing to get what you want.


This is your equation:

\text{ASD}(P_\text{ref},P_\text{auto})=\frac{1}{\vert P_\text{ref}\vert}\sum_{p\in P_\text{ref}}d(p,P_\text{auto}),

enter image description here

This is another equation (which you posted yesterday -- I'm sorry if I remember it wrong:

\text{MSD}(P_\text{ref},P_\text{auto})=\max\left\{\max_{q\in P_\text{ref}}d(q,P_\text{auto}),\max_{q\in P_\text{auto}}d(q,P_\text{ref})\right\},

enter image description here


In a bit more advanced level (it is still basic) you should define your own \pref and \pauto to avoid using too many P_\text{ref} and P_\text{auto}. This is a complete code:

\documentclass{article}
\usepackage{amsmath}
\newcommand{\pref}{P_\text{ref}}
\newcommand{\pauto}{P_\text{auto}}
\begin{document}
\[
    \text{ASD}(\pref,\pauto)=\frac{1}{\vert\pref\vert}\sum_{p\in\pref}d(p,\pauto),
\]
And
\[
    \text{MSD}(\pref,\pauto)=\max\left\{\max_{q\in\pref}d(q,\pauto),\max_{q\in\pauto}d(q,\pref)\right\},
\]
\end{document}

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