a = 1:9, b = 9-a tf = a>4 tf = a==b tf = b - (a>2) x = (-3:3)/3 sin(x)./x x = x + (x==0)*eps sin(x)./x tf = a>4 tf = -(a>4) tf = (a>2) & (a<6) discont xor(x,y), any(x), all(x), isnan(x), isinf(x), finite(x)