This function calculates the auto covariance and auto cross covariance for generating scale-based descriptors of the same length.
The lag parameter. Must be less than the amino acids.
lag * p^2 named vector, the element names are
constructed by: the scales index (crossed scales index) and lag index.
Please see the references for details about auto cross covariance.
Nan Xiao <https://nanx.me>
Wold, S., Jonsson, J., Sj\"orstr\"om, M., Sandberg, M., & R\"annar, S. (1993). DNA and peptide sequences and chemical processes multivariately modelled by principal component analysis and partial least-squares projections to latent structures. Analytica chimica acta, 277(2), 239–253.
Sj\"ostr\"om, M., R\"annar, S., & Wieslander, A. (1995). Polypeptide sequence property relationships in Escherichia coli based on auto cross covariances. Chemometrics and intelligent laboratory systems, 29(2), 295–305.
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