Booleans in

About Booleans

The boolean values in R are TRUE and FALSE.

Boolean operators:

!TRUE # FALSE (not)
TRUE && FALSE # FALSE (scalar and)
TRUE || FALSE # TRUE (scalar or)

TRUE & FALSE # FALSE (vector and)
TRUE | FALSE # TRUE (vector or)

Note that there are two sets of and/or operators. The double-character versions operate on single values. The single-character variants operate element-wise on vectors, returning a vector of booleans.

Using && or || on vectors means that only fhe first element is used in the comparison, yielding a single TRUE/FALSE and probably a warning message.

This distinction will become important, and probably clearer, in the vector-filtering concept.