Talk:Cross-correlation matrix

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function corr(..) used in definition is not defined, and there is no (at least i cannot find any) link to its definition in wikipedia.

ie. it reads: >>> For random variables X(s) and X(t) at different points s and t of some space, the correlation function is

  C(s,t) = corr(X(s),X(t))

<<< but no explanation/link/definition of what "corr" is.

this is very important! it makes this page useless. --- I second the above comment, the definition given makes no sense. This page is useless. —Preceding unsigned comment added by 18.95.7.3 (talk) 23:14, 29 November 2008 (UTC)[reply]

I have added wikilink to article which now has definition of this notation. Melcombe (talk) 12:14, 2 December 2008 (UTC)[reply]

For me this page is unclear because it is unclear to me if X₁ (one of the elements of X) is a scalar or a vector.

(if it is a vector, then I suppose the number of elements in X_j and Y_k should be identical?) 83.83.238.65 (talk) 11:48, 1 July 2022 (UTC)[reply]

What then is the point of having an article titled "correlation function" which just points to another article for the definition of the correlation function? — Preceding unsigned comment added by 132.3.33.68 (talk) 19:06, 14 August 2012 (UTC)[reply]

I think a proper article should be self consistent. The introduction of the definition of correlation, just for the case under consideration, is definitely needed here. It would increase the length just by a couple of lines but the page would be clear. Stefano.nicotri (talk) 23:12, 26 November 2014 (UTC)stefano[reply]