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2002 Mar 28
3
Vectorizing closest match
If anyone has a very fast vectorized method for doing the following I would appreciate some help. I want to avoid outer() to limit memory problems for very large n.
Let
x = real vector of length n
y = real vector of length n
w = real vector of length m, m typically less than n/2 but can be > n
z = real vector of length m
For w[i], i=1,,,m, find the value of x that is closest to w[i]. In