Efficient ways to check and count zero or one in a vector of logical variables

In Matlab, given a vector of logicals, for example, v>0 creats a vector of logicals where v is a numerical vector, what are the efficient ways to respectively

(1) check if there is zero(s) in it?

(2) check if there is one(s) in it?

(3) count how many zeros in it?

(4) count how many开发者_StackOverflow ones in it?

Thanks!

Assuming v is a logical vector

(1) ~all(v) or any(~v) is true only if there is at least one zero

(2) any(v) or ~all(~v) is true only if there is at least one one

(3) sum(~v) counts zeros (numel(v)-sum(v) is faster according to @gnovice)

(4) sum(v) counts ones