Compare vectors properly taking into account uniform vectors (with same values on all dimensions) and non-specified dimensions.
vector (numeric or data frame/list) or set of vectors whose similarity to the target is to be determined
Value to be returned for incomparable vectors, in which all dimension pairs contain underspecified values
logical for addition of noise to outcome (default is TRUE)
Differences between vectors are determined per dimension, weighted (cf.
world$weigh), and then averaged. If vectors are not specified for certain target dimensions, this does not count as a mismatch.
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