rat(ratio, numerator, denominator, check = TRUE)compatible.ratio
except that it also belongs to the class "rat"
and has additional attributes numerator and denominator."rat" is a simple mechanism for keeping track of
the numerator and denominator when calculating a ratio. Its main
purpose is simply to signal that the object is a ratio. The function rat creates an object of class "rat"
given the numerator, the denominator and the ratio.
No calculation is performed;
the three objects are simply stored together.
The arguments ratio, numerator, denominator
can be objects of any kind. They should belong to the same class.
It is assumed that the relationship
$$\mbox{ratio} = \frac{\mbox{numerator}}{\mbox{denominator}}$$
holds in some version of arithmetic. However, no calculation is
performed.
By default the algorithm checks
whether the three arguments ratio, numerator,
denominator are compatible objects, according to
compatible.
The result is equivalent to ratio except for the
addition of extra information.
compatible,
pool