[R] Select the last rows of when specific conditions are met.

[mardijk]

I am so sorry for the lack of clarity. 

I have a few subjects, every subject has done a number of trials and per
trial there is a measurement per millisecond (represented in the variable
tt), so every unique trial is represented in around 2500 rows. 

An example of data would be:

Subj | Trial | tt | v4 | v5 | ... | v17
1          1           1     ..
1          1           2     ..
1          1           3     ..
1          1           4     ..
1          1           5     ..
1          2           1     ..
1          2           2     ..
1          2           3     ..
1          3           1     ..
1          3           2     ..
1          3           3     ..
2          1           1     ..
2          1           2     ..
2          1           3     ..
etc. 

In the above dataset, how can I single out the trial that > 4, and delete
the last two rows (tt = 4&5).

I hope this makes more sense.



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