relations (version 0.6-4)

elements: Elements of Relation Domains

Description

Obtain elements of endorelation domains which have certain properties.

Usage

relation_elements(x, which, ...)

Arguments

x

an endorelation.

which

a character string specifying the property to be tested for. Currently, one of "minimal", "first", "last", or "maximal", or a unique abbreviation thereof.

...

additional arguments to be employed in the property tests.

Value

• A set with the elements having the specified property.

Details

Let $R$ be an endorelation with domain $(X, X)$ and consider elements $x$ and $y$ of $X$. We say that $x$ is [object Object],[object Object],[object Object],[object Object] When computing the tests for the above properties, an additional na.rm argument can be given to control the handling of missing incidences. By default, these are treated as false, to the effect that they invalidate for all tests (corresponding to na.rm = FALSE) and pass the there is no tests (corresponding to na.rm = TRUE).