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...w> ?????: > Suppose I have two vectors, x and y. Is there a way > to do the covariance matrix with ?apply?. There is no covariance matrix for just two samples (vectors) 'x' and 'y'. You can only get one covariance value for these. If you had a pair of vectors of _random variates_, the situation would be different, but those are more abstract mathematical concepts. You would need to sample every random variate, producing two matrices 'x' and 'y' in order to calculate a covariance matrix for them. -- Best regards, Ivan

OK. Thanks to all. Suppose I have two vectors, x and y. Is there a way to do the covariance matrix with ?apply?. The matrix I need really contains the deviation products divided by the degrees of freedom (n-1). That is, the elements (1,1), (1,2),...,(1,n) (2,1), (2,2),...., (2,n) .... (n,1),(n,2),...,(n,n). > Hello, > > This doesn't make sense, if you have only one vector you