Create and start a timer that displays the message ’timer started.’ as the StartFcn callback and generates a random number as the TimerFcn callback. Delete the timer.

t = timer('StartFcn',@(~,~)disp('timer started.'),'TimerFcn',@(~,~)disp(rand(1)));
start(t)
delete(t)

timer started.
    0.9706

Your output from rand will vary.

Create and start three timers that displays a message for the StartFcn callbacks and compute the sine, cosine, and tangent of pi/4 as the TimerFcn callbacks. Delete the timers.

t1 = timer('StartFcn',@(~,~)disp('t1 started.'),'TimerFcn',@(~,~)sin(pi/4)); 
t2 = timer('StartFcn',@(~,~)disp('t2 started.'),'TimerFcn',@(~,~)cos(pi/4)); 
t3 = timer('StartFcn',@(~,~)disp('t3 started.'),'TimerFcn',@(~,~)tan(pi/4)); 
start([t1 t2 t3]);
delete([t1 t2 t3]);

t1 started.
t2 started.
t3 started.