6

I want to make an equation that use ceiling, and that's what I'm doing:

\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{mathtools}
\DeclarePairedDelimiter{\ceil}{\lceil}{\rceil}
\begin{equation}
\ceil[\big]{\frac{log{(1-P_{0})}}{log{(1-p)}}}
\end{equation}

The result is not as good as I want it:

Enter image description here

How do I make the ceiling cover the whole fractions?

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6
  • Welcome to TeX.SX! Have you tried something other than \big?
    – TeXnician
    Apr 27, 2017 at 14:59
  • 1
    I'm voting to close this question because it was solved in the comments.
    – Stefan Pinnow
    Apr 27, 2017 at 15:07
  • 1
    you don't keep it for other people ?
    – elia
    Apr 27, 2017 at 15:08
  • 5
    @StefanPinnow don't close it as off-topic (because it is not). Either find the duplicate question that this must be or it is a valid question which even has been answered already…
    – cgnieder
    Apr 27, 2017 at 16:20
  • 1
    you also need a backslash on your \log(.) function.
    – robert bristow-johnson
    Apr 28, 2017 at 0:51

2 Answers 2

Reset to default
14

You should read some guides (starter guides) for LaTeX and math (especially about the sizes). With the knowledge about them you could easily adapt to this (\bigg):

ceiling

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{mathtools}
\DeclarePairedDelimiter{\ceil}{\lceil}{\rceil}
\begin{document}
\begin{equation}
\ceil[\bigg]{\frac{\log{(1-P_{0})}}{\log{(1-p)}}}
\end{equation}
\end{document}
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5
  • Thank you, yes I'm new to latex and i have dead line to follow that's why I had no time to adapt for this first.
    – elia
    Apr 27, 2017 at 15:04
  • 1
    @elia You're welcome. But as I already posted: The usual strategy to say thank you is to use the upvote or accept button (if it works for you).
    – TeXnician
    Apr 27, 2017 at 15:06
  • bro I know but i can't vote until 10 Min pass, I'll surly select your answer
    – elia
    Apr 27, 2017 at 15:07
  • 6
    Please, please change both instances of log to \log.
    – Mico
    Apr 27, 2017 at 16:49
  • 1
    @Mico Done. But the important part of the answer isn't the code, but the reference to starter guides ;)
    – TeXnician
    Apr 27, 2017 at 19:40
9

Very simple, you can work with the asterisk. 

\documentclass{memoir}

\usepackage{amsmath,amsfonts,amssymb}
\usepackage{mathtools}
\DeclarePairedDelimiter{\ceil}{\lceil}{\rceil}

\begin{document}

\begin{align}
    \ceil*{\frac{\log (1-P_{0})}{\log (1-p)}}
\end{align}

\end{document}

I also applied some minor improvements on log vs \log.

enter image description here

Please consider the manual http://www.ctan.org/pkg/mathtools .

Just for adding some informal tags: Kenneth Eugene Iverson floor ceiling notation.

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2
  • 2
    I like the »asterix« but I guess you meant asterisk? ;)
    – cgnieder
    Apr 27, 2017 at 16:28
  • 2
    That is a Freudian slip. I demand to introduce asterix as a synonym for asterisk. Didn't Knuth introduced the word perm for permutation?
    – CampanIgnis
    Apr 27, 2017 at 17:15

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