[S] Data Frame Subsetting Question

Humbolt, Allen (HumboltA@kochind.com)
Thu, 28 May 1998 16:52:23 -0500


I have a data frame with data like the following.
Class A B Index
1 16 17.43 1
1 17 17.43 2
1 18 17.43 3
1 19 17.43 4
2 17 18.02 5
2 18 18.02 6
2 19 18.02 7

My goal is to select the subset of this data frame where A is closest to B
within each class. My desired result for the above data would be the
following.
Class A B Index
1 17 17.43 2
2 18 18.02 6

Any suggestions for an easy way to do this?

Allen Humbolt
Quantitative Analyst
Koch Industries, Inc.
HumboltA@kochind.com
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