[R] Turning a logical vector into its indices without losing itslength

[Leeds, Mark (IED)]

There's a typo in my previous message. logvec should be invec. sorry.


-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Leeds, Mark (IED)
Sent: Friday, August 24, 2007 5:12 PM
To: r-help at stat.math.ethz.ch
Subject: [R] Turning a logical vector into its indices without losing
itslength

I have the code below which gives me what I want for temp based on
logvec but I was wondering if there was a shorter way ( i.e :
a one liner ) without having to initialize temp to zeros.  This is
purely for learning purposes. Thanks.

logvec <- c(TRUE,FALSE,FALSE,TRUE,FALSE,FALSE,TRUE,FALSE)

temp<-numeric(length(invec))
temp[invec]<-which(invec)
temp

[1] 1 0 0 4 0 0 7 0

obviously, the code below doesn't work.

temp <- which(invec)
> temp
[1] 1 4 7
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