covmatrix.m

%covmatrix源程序
function [C, m] = covmatrix(X) 
%COVMATRIX Computes the covariance matrix of a vector population. 
%   [C, M] = COVMATRIX(X) computes the covariance matrix C and the 
%   mean vector M of a vector population organized as the rows of 
%   matrix X. C is of size N-by-N and M is of size N-by-1, where N is 
%   the dimension of the vectors (the number of columns of X). 
 
%   Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins 
%   Digital Image Processing Using MATLAB, Prentice-Hall, 2004 
%   $Revision: 1.4 $  $Date: 2003/05/19 12:09:06 $ 
 
[K, n] = size(X); 
X = double(X);