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############################################################
Lengths
############################################################
A length is a measure of distance. Many LaTeX commands take
a length as an argument.
\newlength: Define a new length.
\setlength: Set the value of a length.
\addtolength: Add a quantity to a length.
\settodepth: Set a length to the depth of something.
\settoheight: Set a length to the height of something.
\settowidth: Set a length to the width of something.
Predefined lengths: Lengths that are, like, predefined.
############################################################
\newlength ::newlength::
############################################################
\newlength{\gnat}
The \newlength command defines the mandatory argument, \gnat,
as a length command with a value of 0in. An error occurs if a
\gnat command already exists.
############################################################
\setlength ::setlength::
############################################################
\setlength{\gnat}{length}
The \setlength command is used to set the value of a length
command. The length argument can be expressed in any terms
of length LaTeX understands, i.e., inches (in),
millimetres (mm), points (pt), etc.
############################################################
\addtolength ::addtolength::
############################################################
\addtolength{\gnat}{length}
The \addtolength command increments a "length command" by the
amount specified in the length argument. It can be a negative
amount.
############################################################
\settodepth ::settodepth::
############################################################
\settodepth{\gnat}{text}
The \settodepth command sets the value of a length command
equal to the depth of the text argument.
############################################################
\settoheight ::settoheight::
############################################################
\settoheight{\gnat}{text}
The \settoheight command sets the value of a length command
equal to the height of the text argument.
############################################################
\settowidth ::settowidth::
############################################################
\settowidth{\gnat}{text}
The \settowidth command sets the value of a length command
equal to the width of the text argument.
Predefined lengths
\width ::width::
\height ::height::
\depth ::depth::
\totalheight ::totalheight::
These length parameters can be used in the arguments of the
box-making commands
See section Spaces & Boxes.
They specify the natural width etc. of the text in the box.
\totalheight equals \height + \depth. To make a box with the
text stretched to double the natural size, e.g., say
\makebox[2\width]{Get a stretcher}
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