covariance_i_j_vec Computes the approximate covariance tensor of the functional data for lag
windows defined by i,j; a vectorized version of covariance_i_j.
covariance_i_j_vec(f_data, i, j)
the functional data matrix with observed functions in the columns
the indices i,j in 1:T that we are computing the covariance for
A 4-dimensional array, encoding the covariance tensor of the functional data for lag windows defined by i,j.
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