compare row values over multiple rows (R)

Question

I don\'t think this question has asked yet (most similar questions are about extracting data or returning a count). I am new to R, so any help would be appreciated!

Answer 1

Here is my code. I will post the explanation in some time.

require(plyr)
ddply(Data, .(ID), summarize, timeToEQ = Position(isTRUE, abs(diff(CC)) < 0.05 ))

  ID timeToEQ
1  1        3
2  2        2

EDIT. Here is how it works.

1. ddply breaks Data into subsets based on ID.
2. diff(CC) computes the difference between CC of successive rows.
3. abs(diff(CC)) < 0.05) returns TRUE if the difference has stabilized.
4. Position locates the first instance of an element which satisfies isTRUE.