How can I put a range symbol over a character?
The symbol I am looking for is similar to this:
\overleftrightarrow{T}
But instead of using an arrow at each end, I want to put a black dot at each end.
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Cf. https://tex.stackexchange.com/q/85495/15925 – Andrew Swann Dec 03 '17 at 16:33
3 Answers
6
Here's an extensible version.
\documentclass{article}
\usepackage{amsmath}
\makeatletter
\newcommand{\range}{\mathpalette{\overarrow@\range@}}
\newcommand{\range@}{%
\arrowfill@\leftrangebullet\relbar\rightrangebullet
}
\newcommand{\leftrangebullet}{\mathrel{\smallbullet}\joinrel\relbar}
\newcommand{\rightrangebullet}{\relbar\joinrel\mathrel{\smallbullet}}
\newcommand{\smallbullet}{%
\vcenter{\hbox{$\m@th\scriptscriptstyle\bullet$}}%
}
\makeatother
\begin{document}
$\range{T}+\range{ABCD}$
\end{document}
Now also \leftrange and \rightrange:
\documentclass{article}
\usepackage{amsmath}
\makeatletter
\newcommand{\range}{\mathpalette{\overarrow@\range@}}
\newcommand{\leftrange}{\mathpalette{\overarrow@\leftrange@}}
\newcommand{\rightrange}{\mathpalette{\overarrow@\rightrange@}}
\newcommand{\range@}{%
\arrowfill@\leftrangebullet\relbar\rightrangebullet
}
\newcommand{\leftrange@}{%
\arrowfill@\leftrangebullet\relbar\relbar
}
\newcommand{\rightrange@}{%
\arrowfill@\relbar\relbar\rightrangebullet
}
\newcommand{\leftrangebullet}{\mathrel{\smallbullet}\joinrel\relbar}
\newcommand{\rightrangebullet}{\relbar\joinrel\mathrel{\smallbullet}}
\newcommand{\smallbullet}{%
\vcenter{\hbox{$\m@th\scriptscriptstyle\bullet$}}%
}
\makeatother
\begin{document}
$\range{T}+\range{ABCD}$
$\leftrange{T}+\leftrange{ABCD}$
$\rightrange{T}+\rightrange{ABCD}$
\end{document}
egreg
- 1,121,712
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Just a quick question, How can I do a half range?. For example for start range: just the left circle and the bar – AAA Dec 03 '17 at 16:56
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interesting. the length of the bar isn't the same for a single-ended vs. double-ended extender. and it's not just the width of the ball on the end. – barbara beeton Dec 04 '17 at 17:21
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@barbarabeeton There is a minimum width, because there is
\relbaron both sides. This shows for the single symbol. – egreg Dec 04 '17 at 18:15 -
but i'm not looking at the one-letter example. i'm looking at the "ABCD" example. compare line 1 with line 2. (the one=letter example is just fine.) – barbara beeton Dec 04 '17 at 18:19
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@barbarabeeton There is just a tiny difference; you can see it better if you only pile the long bits. It's due to the sidebearings of the bullet. As far as I can see it's less than 0.1pt – egreg Dec 04 '17 at 18:43
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apologies. i was thrown off by the difference in width of the one-letter example. if i had looked at the relative positions of the plus signs, i would not have been so confused. – barbara beeton Dec 04 '17 at 19:40
4
\documentclass{article}
\usepackage{amsmath}
\usepackage{fdsymbol}
\begin{document}
$\overset{\leftrightblackspoon}{T}$ or
$\overset{\leftrightblackspoon}{\text{T}}$
\end{document}
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@DiegoDiazDominguez Glad to hear. Please consider clicking the checkmark symbol left of the answer in order to indicate that this question is answered. – Dec 03 '17 at 15:57
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@egreg Thanks for pointing this out. I am wondering if there is a survey of these issues. To my knowledge, the calatlogue of symbols does not explain this, or was I looking at the wrong place? – Dec 03 '17 at 16:21
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You should look at the package documentation first: FdSymbol is a font of mathematical symbols designed as a companion to Typotheque’s Fedra family, but it might also fit well to other contemporary typefaces. Note “might”. – egreg Dec 03 '17 at 16:25
2
How does that look?
\documentclass[]{standalone}
\usepackage{amsmath}
\begin{document}
$\overset{\cdot - \cdot}{T}$
\end{document}
Skillmon
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