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  unit objects.  In particular, it is possible to add and subtract
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  unit objects.  In particular, it is possible to add and subtract
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  unit objects (e.g., \code{unit(1, "npc") - unit(1, "inches")}),
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  unit objects (e.g., \code{unit(1, "npc") - unit(1, "inches")}),
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  and to specify the minimum or maximum of a list
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  and to specify the minimum or maximum of a list
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  of unit objects (e.g., \code{min(unit(0.5, "npc"), unit(1,
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  of unit objects (e.g., \code{min(unit(0.5, "npc"), unit(1,
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    "inches"))}).
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    "inches"))}).
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  There is a \code{format} method for units, which should respond to
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  the arguments for the default \code{format} method, e.g.,
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  \code{digits} to control the number of significant digits
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  printed for numeric values.
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}
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}
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\section{WARNING}{
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\section{WARNING}{
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  There is a special function \code{unit.c} for concatenating
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  There is a special function \code{unit.c} for concatenating
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  several unit objects.
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  several unit objects.
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