[R] how to find the location of the first TRUE of a logical vector

Jason Liao jg_liao at yahoo.com
Thu Mar 6 03:43:59 CET 2003

Many thanks to all who replied: Marc Schwartz, Douglas Grove, Spencer
Graves, J.R. Lockwood, Roger Peng, Martina Pavlicova, Steve
Su,james.holtman, Wiener, Matthew, Domijan, Katarina and Douglas Bates.

Let x be the logical vector. The best solution seems to be: 

Now my code is much simpler.


Jason G. Liao, Ph.D.
Division of Biometrics
University of Medicine and Dentistry of New Jersey
335 George Street, Suite 2200
New Brunswick, NJ 08903-2688
phone (732) 235-8611, fax (732) 235-9777

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