用给定的多项式，如y=x3-6x2+5x-3，在[-1，1]上等间隔产生20组数据(xi,yi，i=1,2,…,n),再在yi上添加随机干扰(可用rand产生(-5,5)均匀分布随机数)。请 (1)对xi和添加了随机干扰的yi作3次多项式拟合，与原系数比较。 -With the given polynomial, such as y=x3-6x2+5x-3, [-1, 1] intervals of 20 sets of data (Xi, Yi, i=1,2,... , n), and

Commonly used uation measures including Recall, Precision, F-Measure and Rand Accuracy are biased and should not be used without clear understanding of the biases, and corresponding identification of chance or base case levels of the statistic.

产生基带信号 本例中使用matlab中的rand函数随机产生10个随机数，并采用就近取整的办法使其值为0、1.此过程产生的码为绝对码。并且，每个值需要分配一定的长度。-enerates a baseband signal In this example, we use the rand function in matlab to randomly generate 10 random numbers, and use the nearest rounding method to make