Thanks Patrick, Albyn, and Vadim.
rle() does what I want and, Vadim, your method gives the same results in a different form. I appreciate the help!
Sean
On Jan 27, 2005, at 5:29 PM, Vadim Ogranovich wrote:
Untested:
c(TRUE, b[-1] != b[-length(b)]) gives you the (logical) indexes of the beginnings of the runs c(b[-1] != b[-length(b)], TRUE) gives you the (logical) indexes of the ends of the runs
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Sean Davis Sent: Thursday, January 27, 2005 2:14 PM To: r-help Subject: [R] Finding "runs" of TRUE in binary vector
I have a binary vector and I want to find all "regions" of that vector that are runs of TRUE (or FALSE).
a <- rnorm(10) b <- a<0.5 b[1] TRUE TRUE TRUE FALSE TRUE FALSE TRUE TRUE TRUE TRUE
My function would return something like a list: region[[1]] 1,3 region[[2]] 5,5 region[[3]] 7,10
Any ideas besides looping and setting start and ends directly?
Thanks, Sean
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