[R] select rows by criteria

syrvn mentor_ at gmx.net
Thu Mar 1 13:27:45 CET 2012


I am stuck with selecting the right rows from a data frame. I think the
problem is rather how to select them
then how to implement the R code.

Consider the following data frame:

df <- data.frame(ID = c(1,2,3,4,5,6,7,8,9,10), value =

What I want to achieve is to select 7 rows (values) so that the mean value
of those rows are closest
to the value of 35 and the remaining 3 rows (values) are closest to 45.
However, each value is only
allowed to be sampled once!

Any ideas, how to achieve that?


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