[R] how to calculate covariance matrix in R? why cov doesn't work

aegea gcheer3 at gmail.com
Fri Dec 4 05:29:04 CET 2009


Sorry. It may be a stupid question. 
I have two vectors
How can I get the variance-covariance matrix of these two vectors?
I tried cov(a,b), I got a number not a matrix.
I tried to transpose vector a and b as t(a) and t(b), it still cannot work.

Any suggestions? Thank a lot!
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