[R] Problem with subset

From: Luca Mortarini <l.mortarini_at_isac.cnr.it>
Date: Fri, 06 Jun 2008 19:12:00 +0200 (CEST)


     I am new to R and i am looking for a way to extract a subset from a vector.
I have a vector of number oscillating around zero (a decreasing autocorrelation function) and i would like to extract only the first positive part of the function (from zero lag to the lag where the function inverts its sign for the first time).
I have tried


but this obviously extract all the positive intervals not only the first one.  Is there a logical statement i can use in subset? I prefer not to use an if statement that would probably slow down the code. Thanks a lot,


dr. Luca Mortarini               l.mortarini_at_isac.cnr.it
UniversitÓ del Piemonte Orientale
Dipartimento di Scienze e Tecnologie Avanzate

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