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Is there a macro in latex to write ceil(x) and floor(x) in short form? The long form

\left \lceil{x}\right \rceil 

is a bit lengthy to type every time it is used.

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Thank you, it seems I was asking questions in the wrong forum indeed! –  danny Jul 7 '13 at 17:35

2 Answers 2

up vote 33 down vote accepted

Using \DeclarePairedDelimiter from mathtools, you could define macros \ceil and \floor, which will scale the delimiters properly (if starred):


    \floor*{\frac{x}{2}} < \frac{x}{2} < \ceil*{\frac{x}{2}}


Scaling delimiters with <code>\floor</code> and <code>\ceil</code>

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That's neat. Didn't know about this command. –  Jan Jun 8 '13 at 11:47
Doesn't work here. Any idea how to do it without mathtools? –  David 天宇 Wong Mar 5 at 1:54
  1. You can define your own macro via the \def command anywhere in your document. For example


    and then just write \lc x \rc.

  2. Or you use the \providecommand in the preamble, e.g.

    \providecommand{\myceil}[1]{\left \lceil #1 \right \rceil }

    to simply use \myceil{x} in your document.

  3. Use an editor, like vim, that allows for defining shortcuts for quick and efficient editing.
  4. And, finally, don't forget about readability of your tex document. Check out this thread for some instructive comments on how to write efficient and readable tex math docs.
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