[R] Find the closest value in a list or matrix

R_Learner sschiang8 at gmail.com
Wed Jul 9 17:28:01 CEST 2008

I have a long list of numbers [3.4,5.4,3.67,....], and I basically want to
find the index of the number closest to this number that I have, let's say
5.43. How would I do this without writing a for loop (I have to do this many
times for several lists)? Is there a "lookup" function in R? 

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