Hi Joh.
To echo Bert, more detail would be helpful. But here is a stab at something.
Given two numeric vectors, a and b, for each entry of a this finds the index in
b of the closest match. It's not efficient at all.
> bestmati <- function( a, b ) { return( sapply( a, function( x ) { which.min(
> ( b - x )^2 ) } ) ) }
> bestmati( c( 3, 9 ), c( 1, 4, 2, 6, 7, 5 ) )
[1] 2 5
>
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