Is there a convenient way to typeset the floor or ceiling of a number, without needing to separately code the left and right parts? For example, is there some way to do $\ceil{x}$
instead of $\lceil x \rceil$
?
\usepackage{mathtools}
\DeclarePairedDelimiter{\ceil}{\lceil}{\rceil}
The command \ceil
will do; if called as \ceil*{x}
it will add \left
and \right
; you can also call it as
\ceil[\big]{x} \ceil[\Big]{x} \ceil[\bigg]{x} \ceil[\Bigg]{x}
to state explicitly the size of the delimiters.
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28Even after more than 10 years of LaTeXing one still learns some new tricks! – yo' Jan 25 '12 at 17:32
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19
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1@jamaicanworm There is, I believe also on this site. But I won't tell you: use
\left
and\right
only when they are really needed. – egreg Apr 21 '12 at 17:50 -
2@jamaicanworm Swap definition of starred and non-starred command discusses switching the starred with non-starred version. – Qrrbrbirlbel Nov 11 '12 at 1:36
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8To typeset the floor function, just replace "ceil" with "floor". This may be obvious, but it might save you the trouble of consulting documentation. – void-pointer Sep 30 '13 at 7:19
Here is a simple xparse
implementation of \ceil
, similar to that provided by mathtools
' \DeclarePairedDelimiter
:
\documentclass{article}
\usepackage{xparse}% http://ctan.org/pkg/xparse
\NewDocumentCommand{\ceil}{s O{} m}{%
\IfBooleanTF{#1} % starred
{\left\lceil#3\right\rceil} % \ceil*[..]{..}
{#2\lceil#3#2\rceil} % \ceil[..]{..}
}
\begin{document}
\[\ceil[\big]{x} \quad \ceil[\Big]{x} \quad \ceil[\bigg]{x} \quad \ceil[\Bigg]{x} \quad \ceil*[\big]{\frac{1}{2}}\]
\end{document}
The optional argument is ignored in the starred version of \ceil*[..]{..}
.
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4You could eliminate the
\IfNoValueTF {\lceil#3\rceil}
if you used{s O{} m}
. Then the second arg#2
will be defined so only need#2\lceil#3#2\rceil
. – Peter Grill Jan 25 '12 at 18:29
\lceil
and\rceil
are the appropriate markups. – Hugh Perkins Aug 21 '17 at 8:15$\lceil x \rceil$
was already the solution I was looking for ;) – Christopher K. Aug 29 '19 at 16:24