R how many element satisfy a condition?

Question

Is there a better way to count how many elements of a result satisfy a condition?

a <- c(1:5, 1:-3, 1, 2, 3, 4, 5)
b <- c(6:-8)
u <- a > b
length(u[u == TRUE])
## [1] 7

Answer 1

If z consists of only TRUE or FALSE, then simply

length(which(z))