>> log(sqrt(854)) % natural logarithm ans = 3.375 >> 0.5*log(854) ans = 3.375 >> float(sin(pi/2)) % argument in radian ans = 1 >> gammaln(1234) % log( gamma( x ) ) ans = 7547 >> primes(1000000000000000001) ans = [ 101 9901 999999000001 ] >> factorial(35) ans = 1.0333E40 >> factorial(rat(35)) % to make it exact. ans = 10333147966386144929666651337523200000000