any(x)
any takes a single logical argument x and returns a
logical value indicating whether or not any of the elements of
x are true.
The value returned is true if any the values in x are
true, and false if all the values in x are
false. If x consists of a mix of false and
NA values, then any returns NA.
Examples
if(any(x < 0)) cat("x contains negative values\n")