[R] Sub-vector

[King, David]

Wuming,

which(a) will identify the TRUE values and sum(a) will tell you how many
TRUE values there are.

David


-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Wuming Gong
Sent: 29 March 2006 18:21
To: r-help at stat.math.ethz.ch
Subject: [R] Sub-vector


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Dear list,

Given a vector of logical values, say

>a <- c(TRUE,TRUE,TRUE,FALSE,FALSE,FALSE,FALSE,TRUE,TRUE,TRUE)

Are there any R functions that can tell whether there are two or more
"TRUE" in a row in this vector?

Thanks,

Wuming

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