### Hypertext Help with LaTeX

# \rule

`\rule[raise-height]{width}{height}`

The `\rule` command generates a rectangular "blob of ink."
It can be used to produce horizontal or vertical lines. The arguments
are defined as follows.

`raise-height` specifies how high to raise the rule (optional)
`width` specifies the length of the rule (mandatory)
`height` specifies the height of the rule (mandatory)

The default value for `raise-height` is zero; a negative value
lowers the rule.
The reference point of the rule box is the lower left-hand corner.

A rule box of zero width may be used as a "strut" which is invisible but
which causes LaTeX to adjust veritcal spacing to leave room. This can
be particularly useful where the
`\vspace` command cannot be used,
for example, within mathematical formulas.

The `\rule` command is fragile.

See Spaces and Boxes

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Revised: Sheldon Green, 21 Aug 1995.