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neqn [ -dxy ] [ -pn ] [ -sn ] [ -fn ] [ files ]
The -T may be used to instruct eqn on the minimum point size to use. Accepted values are currently:
+-------+------------------------------+----------------+
|Option | Description | Min point size |
+-------+------------------------------+----------------+
|lj | HP LaserJet family (default) | 5 |
+-------+------------------------------+----------------+
|ps | PostScript Printer | 1 |
+-------+------------------------------+----------------+
|aps | Autologic APS-5 | 5 |
+-------+------------------------------+----------------+
|cat | Wang CAT. | 6 |
+-------+------------------------------+----------------+
A line beginning with .EQ marks the start of an equation; the end of an equation is marked by a line beginning with .EN. Neither of these lines is altered, so they may be defined in macro packages to get centering, numbering, etc. It is also possible to designate two characters as delimiters; subsequent text between delimiters is treated as eqn input. Delimiters may be set to characters x and y with the command-line argument -dxy or (more commonly) with delim xy between .EQ and .EN. The left and right delimiters may be the same character; the dollar sign is often used as such a delimiter. Delimiters are turned off by delim off. All text that is neither between delimiters nor between .EQ and .EN is passed through untouched.
Tokens within
eqn
are separated by
spaces, tabs, new-lines, braces, double quotes,
tildes, and circumflexes.
Braces {} are used for grouping;
generally speaking,
any place a single character such as
x
could appear, a complicated construction
enclosed in braces may be used instead.
Tilde
(~)
represents a full space in the output,
circumflex
(^)
half as much.
Subscripts and superscripts are produced with the keywords sub and sup. Thus, x sub j makes $x sub j$, a sub k sup 2 produces $a sub k sup 2$, while $e sup {x sup 2 + y sup 2}$ is made with e sup {x sup 2 + y sup 2}. Fractions are made with over: For example, a over b yields $a over b$; sqrt makes square roots: 1 over sqrt {ax sup 2+bx+c} results in $1 over sqrt {ax sup 2 +bx+c}$ . The keywords from and to introduce lower and upper limits: $lim from {n ->~inf} sum from 0 to n ~ x sub i$ is made with lim from {n -> inf } sum from 0 to n ~x sub i. Left and right brackets, braces, etc., of the right height are made with left and right: left [ x sup 2 + y sup 2 over alpha right ] ~=~ 1 would produce $left [ x sup 2 + y sup 2 over alpha right ] ~=~ 1$. Legal characters after left and right are braces, brackets, bars, c and f for ceiling and floor, and "" for nothing at all (for a right-side-only bracket). A left thing need not have a matching right thing.
Vertical piles of things are made with
pile,
lpile,
cpile,
and
rpile:
pile {a above b above c}
produces
$pile {a above b above c}$.
Piles may have arbitrary numbers of elements;
lpile
left-justifies,
pile
and
cpile
center (but with different vertical spacing),
and
rpile
right justifies.
Matrices are made with
matrix:
matrix { lcol { x sub i above y sub 2 } ccol { 1 above 2 } }
produces
$matrix { lcol { x sub i above y sub 2 } ccol { 1 above 2 } }$.
In addition, there is
rcol
for a right-justified column.
Diacritical marks are made with dot, dotdot, hat, tilde, bar, vec, dyad, and under: x dot = f(t) bar is $x dot = f(t) bar$, y dotdot bar ~=~ n under is $y dotdot bar ~=~ n under$, and x vec ~=~ y dyad is $x vec ~=~ y dyad$.
Point sizes and fonts can be changed with size n or size ±n, roman, italic, bold, and font n. Point sizes and fonts can be changed globally in a document by gsize n and gfont n, or by the command-line arguments -sn and -fn.
Normally, subscripts and superscripts are reduced by 3 points from the previous size; this may be changed by the command-line argument -pn.
Successive display arguments can be lined up. Place mark before the desired lineup point in the first equation; place lineup at the place that is to line up vertically in subsequent equations.
Shorthands may be defined or existing keywords redefined with define:
Keywords such as sum int inf and shorthands such as >= != and -> are recognized. Greek letters are spelled out in the desired case, as in alpha or GAMMA Mathematical words such as sin, cos, and log are made Roman automatically. Troff.1 four-character escapes such as \(dd (***) and \(gr (\(gr) may be used anywhere. Strings enclosed in double quotes ("...") are passed through untouched; this permits keywords to be entered as text, and can be used to communicate with troff.1 when all else fails. Full details are given in the manual cited below.
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Created by unroff & hp-tools. © by Hans-Peter Bischof. All Rights Reserved (1997).
Last modified 21/April/97