06-77.txt

《MATLAB简明教程》俺买的最新版的MATLAB教材

例6-77  使用orrcoef函数求解相关系数。
>> A=[5 2 7;5 6 8;-1 2 -5]
A =
     5     2     7
     5     6     8
    -1     2    -5
>> a=corrcoef(A)
a =
    1.0000    0.5000    0.9976
    0.5000    1.0000    0.5587
    0.9976    0.5587    1.0000
>>  b=corrcoef(A(:,2),A(:,3))
b =
    1.0000    0.5587
    0.5587    1.0000
>> x = randn(30,4);
>> x(:,4) = sum(x,2);
>> [r,p] = corrcoef(x)
r =
    1.0000    0.3526   -0.0389    0.6631
    0.3526    1.0000    0.0028    0.5960
   -0.0389    0.0028    1.0000    0.5060
    0.6631    0.5960    0.5060    1.0000
p =
    1.0000    0.0560    0.8383    0.0001
    0.0560    1.0000    0.9885    0.0005
    0.8383    0.9885    1.0000    0.0043
    0.0001    0.0005    0.0043    1.0000
>> [i,j] = find(p<0.05)
i =
     4
     4
     4
     1
     2
     3
j =
     1
     2
     3
     4
     4
     4
>>