apply

? Fri, 4 Oct 2024 20:28:01 +0800
Steven Yen <styen at ntu.edu.tw> ?????:

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