is.in: Check if a specific numeric value occurs in a vector.
Description
Another trivial helper function, called internally by eval.paths.
It checks whether the specified (numeric) value is part of a specified vector of (numeric) values.
Usage
is.in(x, c = NULL)
Value
Boolean; TRUE if value is present, FALSE if not.
Arguments
x
A numeric value, for which the presence in a vector is to be checked.