Guide to LaTeX (4th Edition) (Tools and Techniques

394 Appendix B. The L AT E X Clockwork
afterpage (Section 7.1 on page 171) permits commands to be saved
and executed at the end of the current page. This is useful
for forcing stubborn floats to be output right away, with
\afterpage{\clearpage}. If \clearpage were issued directly,
a new page would be inserted at that point. With \afterpage, the
command is reserved until the end of the page.
array (Section 4.8.4 on page 106) is a re-implementation of the tabular
and array environments with several additional features.
bm permits individual math symbols to be printed in bold face with
command \bm{\sym}. Thus $\alpha + \bm{\beta}$ produces
α + β without recourse to the \boldmath command which would
set the whole formula in bold face. There is also a command
\DeclareBoldMathCommand{\name}{\sym} that defines \name to
be \bm{\sym}.
calc re-implements the counter and length commands to allow ‘normal’
arithmetic with them, such as
\setlength{\mylen}{3cm + \textwidth}
\setcounter{page}{\value{section} * 3}
\parbox{\linewidth / \real{1.6}}{...}
Note that the arithmetical expressions can be used not only to set
values but also as arguments to commands and environments.
dcolumn (Section 4.8.4) requires the array package; it allows decimal
point alignment in the tabular tables.
delarray (Section 4.8.4) requires the array package; it permits large
bracketing symbols to be put around array environments, for making
matrices of various sorts.
enumerate (Section 4.3.5, page 74) re-implements the enumerate environment
so that an optional argument determines the numeration
style.
fileerr.dtx when unpacked, produces a set of small files that may
be used to reply to T E X when a file is not found; this makes the
responses similar to those for error messages; the files are named
h.tex, e.tex, s.tex, and x.tex; thus, replying x〈return〉 loads the
last one, which terminates the input.
fontsmpl is a package to output a sample text, accents, and special characters
for a given font; with the accompanying file fontsmpl.tex, a
family such as cmr can be printed with all attributes and encodings.
ftnright puts footnotes in the right-hand column in two-column mode.