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%% P-Values of Matrix % Compute the correlation coefficients and p-values of a normally % distributed, random matrix, with an added fourth column equal to the sum % of the other three columns. Since the last column of |A| is a linear combination of the others, a % correlation is introduced between the fourth variable and each of the other % three variables. Therefore, the fourth row and fourth column of |P| contain very small % p-values, identifying them as significant correlations. % Copyright 2015 The MathWorks, Inc. A = randn(50,3); A(:,4) = sum(A,2); [R,P] = corrcoef(A)