Compliments/Praise

Today's challenge for me, is to give as many compliments as possible. Compliments to the class, to the students, to groups of students. So often all that ends up happening is just yelling at the students who are not doing well. My theory is that if I compliment all of the good behavior I see, then I will be able to focus more on the positive things going on in my classroom. The more time I spend concentrating on and complimenting good behavior, then hopefully the less time the students will spend doing things they're not supposed to. Today during first period, I kept track on a little slip of paper I carried around with me. Each student who completed an assignment I complimented on their good work and I still only had seven compliments. SEVEN! An entire class period and that's all I had. So I'm going to be working harder throughout the day. What do you think? Do compliments need to be given to everybody? Does just complimenting the good kids help others feel incentive to want to get praise?