Fonts & Character Sets ⇒ top half of an integral sign

[manwyddan]

Hi, I'm writing a book on computer science and I'm intending to include a copy of an ASCII table of the old extended character set which included characters for the upper and lower half of an integral sign. There's no obvious symbol, but the the characters are U+2320 and U+2321. I've tried using inputenc/utf8x and declaring the new symbols but I get the message 'Undefined control sequence'.

The relevant lines are ...
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage{textcomp}

\DeclareUnicodeCharacter{"2320}{\integraltp}
\DeclareUnicodeCharacter{"2321}{\integralbt}

and then later
148 & 94 & \"{o} & 180 & B4 & \textSFix & 212 & D4 & \textSFl & 244 & F4 & \integraltp \\

where I try to use the character (and get the error message).

I'm new to Latex and clearly there's something I don't understand going on here - if anyone would like to chip in with a suggestion as to how I might sort this out, that would be great.

cheers
-manwyddan

[frabjous]

The default LaTeX fonts aren't Unicode-compliant and don't have all the Unicode spots filled. The only way I can think of making half an integral sign in regular LaTeX would be to clip a regular integral sign with, e.g., TikZ, e.g., something like this:

Code: Select all

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\clip (0,0) rectangle (1,1);
\draw (0,0) node {\Huge$\int$};
\end{tikzpicture}
\end{document}

No doubt you'd need to tweak that according to your needs.

An alternative, however, would be to switch to XeLaTeX and use a Unicode math font with the fontspec/unicode-math packages. That actually would be fairly easy.

Code: Select all

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{fontspec}
\defaultfontfeatures{Mapping=tex-text}
\newcommand{\integraltp}{{\fontspec{XITS Math}\char"2320}}
\newcommand{\integralbt}{{\fontspec{XITS Math}\char"2321}}
\begin{document}
\integraltp 
\integralbt
\end{document}

The unicode-math package even defines \inttop and \intbottom for you (for math mode):

Code: Select all

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{unicode-math}
\defaultfontfeatures{Mapping=tex-text}
\setmathfont{XITS Math}
\begin{document}
$\inttop$
$\intbottom$
\end{document}

[manwyddan]

many thanks, much appreciated - I'm using tikz for a number of figures in the book so it works well.

[localghost]

[…] I'm using tikz for a number of figures in the book so it works well.

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Best regards and welcome to the board
Thorsten