[R] Another way to count TRUE

[Suharto Anggono Suharto Anggono]

To get the number of TRUE in logical vector 'x',
tabulate(x, 1)
can be used. Actually, it gives count of 1, but TRUE as integer is 1. Since R 3.4.0, it gives a correct answer, too, when the count is 2^31 or more.