Commit | Line | Data |
---|---|---|
48baa1c3 C |
1 | #once #create message |
2 | .ND | |
3 | .tr %$ | |
4 | .EQ | |
5 | delim $$ | |
6 | .EN | |
7 | .LP | |
8 | The next step is to learn how to put big parentheses, | |
9 | brackets, braces or bars around equations, like this: | |
10 | .EQ | |
11 | left | a sup 2 over b sub i right | | |
12 | .EN | |
13 | ||
14 | This is done with two new words called "left" and "right". | |
15 | To put bars around something, you simply say, in the middle | |
16 | of an equation, | |
17 | left | something right | | |
18 | and the job is done. | |
19 | "something" can indeed be anything, from a single letter | |
20 | up to some horribly complicated mess. | |
21 | The bars grow to the right height to cover the | |
22 | "something", automatically. | |
23 | To produce the example above, all that was needed was | |
24 | .EQ | |
25 | left | a sup 2 over b sub i right | | |
26 | .EN | |
27 | ||
28 | For practice, modify file "Example" so it produces output | |
29 | that looks like this, then type "ready". | |
30 | .pl 1 | |
31 | #once #create Ref | |
32 | .LP | |
33 | .EQ | |
34 | left | | |
35 | {a over b ~+~ c over d} over 2 | |
36 | right | | |
37 | .EN | |
38 | .pl 1 | |
39 | #once #create Example | |
40 | .LP | |
41 | .EQ | |
42 | replace me | |
43 | .EN | |
44 | .pl 1 | |
45 | # | |
46 | #once neqn Ref | nroff >X1 & | |
47 | #once neqn message Ref | nroff -T$term %s/tinyms - | |
48 | #user | |
49 | neqn Example | nroff >X2 | |
50 | #cmp X1 X2 | |
51 | #log | |
52 | #next | |
53 | 12.1b 10 |