Correlation between three variables in MATLAB -

in matlab, have following:

a, b, c 1 x 101 row vectors. know 'i' 1 101, a(i), b(i), , c(i) linearly correlated.

how can identify dependence between a, b, , c?

for degree of correlation, can use corrcoef:

data = [a(:) b(:) c(:)]; correlation = corrcoef(data); 

here's test case shows positive/negative correlation degree of correlation,

n = 10000; = randn(n,1); b =  3*a + randn(n,1); c = -2*a + 20*randn(n,1);  correlation =      1.0000    0.9473   -0.1005     0.9473    1.0000   -0.0927    -0.1005   -0.0927    1.0000