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what is correlation of two vectors of 0?

A: 000000000000000 B: 000000000000000

The R cor function gives NA result, but is the correlation 1 or that it is undefined? However, in my model, 0 output is clearly a legitimate output.

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  • $\begingroup$ What would the correlation between two zero vectors even mean? You say it's a legitimate output, but I don't see how it could be. $\endgroup$
    – user3716267
    Commented Sep 29, 2021 at 14:06

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Your vectors have no variance, so correlation is undefined.

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