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>------------------------------------------------------------------------
> exa100800_corrcoef.m,
> to test corrcoef.m ;
>------------------------------------------------------------------------
clear all;
N=256;
f=.1;a1=5;a2=3;
x=a1*sin(2*pi*f*(0:N-1))+2*randn(1,N);
y=a2*sin(2*pi*f*(0:N-1))+randn(1,N);
> 求数据向量 x 和 y 的相关系数矩阵；
c=corrcoef(x,y)