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markertime
2009 Dec 04
3
Use of apply rather than a loop
Colleagues,
R 2.9.0 on all platforms
I have a dataset that contains three columns of interest: ID's, serial
elapsed times, and a marker. Representative data:
Subject Time Marker
1 100.5 0
1 101 0
1 102 1
1 103 0
1 105 0
For each subject, I would like to find the time associated with MARKER
== 1, then replace Time with Time - (Time[Marker == 1])
The result for this