which(lv)[1]
as lv is already a logical vector
Giles
On 2003.03.05 22:44 Spencer Graves wrote:
Also:
which(lv == TRUE)[1]
Spencer Graves
Marc Schwartz wrote:-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jason Liao
Sent: Wednesday, March 05, 2003 3:36 PM
To: [EMAIL PROTECTED]
Subject: [R] how to find the location of the first TRUE of a logical vector
without having to check the vector element by element? Thanks a lot!
Jason
=====
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 http://www.geocities.com/jg_liao
If 'lv' if your logical vector, you could use something like:
min(which(lv == TRUE))
which() would return a vector of the indices within 'lv' that match TRUE and of course min() will give you the lowest index value.
An example:
lv <- c(FALSE, FALSE, FALSE, TRUE, TRUE, FALSE, TRUE) lv
[1] FALSE FALSE FALSE TRUE TRUE FALSE TRUE
min(which(lv == TRUE))
[1] 4
HTH,
Marc Schwartz
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