[Tex/LaTex] An environment for setting \emergencystretch locally

environmentsline-breaking

The following environment, copied from this website about dealing with overfull hboxes, allows one to change the \tolerance parameter for just the paragraph(s) it encloses:

\newenvironment{tolerant}[1]{%
  \par\tolerance=#1\relax
}{%
  \par
}

Unfortunately, the website does not specify a similar environment for locally changing \emergencystretch. Since much of the code in the definition above (notably, the commands \par and \relax) is currently outside my understanding, I would not know how to go about making a similar environment for locally setting \emergencystretch–but I'm sure someone on TeX.SE would know.

How would one write an environment that changes the value of \emergencystretch locally (and makes sure the changes get applied)?

Best Answer

Change \tolerance to \emergencystretch and pass in a length rather than a number.

\par means end of paragraph and is same as a blank line. \relax is a primitive command which does nothing but it stops the scan for a number in case the text started with a digit.

\tolerance=1\relax 2 is ...

sets tolerance to 1 and typesets a 2 but without the \relax or a space then

 \tolerance=12 is..

would set it to 12 and not typeset the 2.

Related Solutions

[Tex/LaTex] verbatim useable with a newenvironment definition

This works for me.

\documentclass{article}
\usepackage{verbatim}
\usepackage{float}
\floatstyle{boxed}
\newfloat{program}{h}{lop}
\floatname{program}{Example}

\newbox\examplebox
\newenvironment{example}[2]{%
    \program
    \caption{#2}%
    \label{#1}%
    \verbatim
}{%
    \endverbatim
    \vskip-.7\baselineskip
    \endprogram
}
\begin{document}
\begin{example}{foo}{caption}
foo
bar
baz
\end{example}
\end{document}

Note that you need to have the \label after the \caption. The \verbatim macro as reimplemented by the verbatim package seems to be looking for \end{foo} where foo is the name of the current environment. This is why it uses \program, \verbatim, \endverbatim, and \endprogram.

The \vskip isn't necessary, but you end up with extra space without it.

[Tex/LaTex] Modify locally the “array” environment for Equation Systems

You want to avoid the \tabcolsep altogether; note also the correction for the null delimiter. You can use an optional argument to enlarge the leading in special cases.

\documentclass{article}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{amsmath}

\newenvironment{system}[1][1.1]
 {\renewcommand{\arraystretch}{#1}
  \left\{\begin{array}{@{}l@{}}}
 {\end{array}\right.\kern-\nulldelimiterspace}

\begin{document}
A centered formula for showing the center:
\[
\int_{-\infty}^{\infty}e^{-x^2}\,dx=\sqrt{\pi}
\]
The new \texttt{system} environment:
\[
\begin{system}
 x^{n}+y^{n}=z^{n}\\
 x^{m}+y^{m}=z^{m}
\end{system}
\]
Predefined \texttt{array} environment:
\[
\left\{%
 \begin{array}{l}
  x^{n}+y^{n}=z^{n}\\
  x^{m}+y^{m}=z^{m}
 \end{array}%
\right.
\]
A \texttt{system} environment with the optional argument:
\[
\begin{system}[1.5]
 x^{n}+y^{n}=z^{n}\\
 x^{m}+y^{m}=z^{m}
\end{system}
\]
\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] verbatim useable with a newenvironment definition

[Tex/LaTex] Modify locally the “array” environment for Equation Systems

Related Question