设置随机数，读取随机数，并显示波形，设置当前时间点，并显示当前时间-setup the randn waveform and time

Demo of adaBoost (adaptive boosting) Xu Cui 2009/05/12 clear training data (1000 samples, 2 dimensions, can be seen as 1000 people, each people have 2 variable: weight and age) data = randn(1000,2) 1000 number (x,y) 2d label