Atoms of Knowledge Structures

Description

Computes atoms of knowledge structures.

Usage

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  katoms(x, items)

Arguments

x

An R object of class kstructure.

items

A set of items for which atoms are computed.

Details

For any item q of the knowledge domain Q, an atom at q is a minimal knowledge state containing q, where minimal refers to the fact that the respective knowledge state is not the union of any other knowledge states.

Value

A list where each element represents the atom(s) of one item specified in items.

References

Doignon, J.-P., Falmagne, J.-C. (1999) Knowledge Spaces. Heidelberg: Springer Verlag.

See Also

kstructure, set

Examples

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kst <- kstructure(set(set("a"), set("a","b"), set("a","c"), set("d","e"), 
   set("a","b","d","e"), set("a","c","d","e"), set("a","b","c","d","e")))
katoms(kst, items=set("a","b","c"))