When a
and b
are 1-dimensional sequences, numpy.cov(a,b)[0][1]
is equivalent to your cov(a,b)
.
The 2×2 array returned by np.cov(a,b)
has elements equal to
cov(a,a) cov(a,b) cov(a,b) cov(b,b)
(where, again, cov
is the function you defined above.)
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