Message-ID: <C310BEAF-325A-459F-8152-67842798B96C@comcast.net>
Date: 2009-11-09T19:38:44Z
From: David Winsemius
Subject: Find the first values in vector
In-Reply-To: <26271555.post@talk.nabble.com>
On Nov 9, 2009, at 1:44 PM, Grzes wrote:
>
> Hi !
> I have a vector:
> vec= TRUE TRUE TRUE TRUE FALSE FALSE FALSE FALSE TRUE TRUE FALSE
> and I'm looking for a method which let me get only the first values
> equal
> TRUE from this vector. It means that I want to get a vector:
> vec_out = TRUE TRUE TRUE TRUE
>
> or posictions values = TRUE: vec_out = 1,2,3,4
?rle
> vec[ 1:rle(vec)$lengths[1] ]
[1] "TRUE" "TRUE" "TRUE" "TRUE"
Although that approach would faid if the first element were "FALSE".
> --
> View this message in context: http://old.nabble.com/Find-the-first-values-in-vector-tp26271555p26271555.html
> Sent from the R help mailing list archive at Nabble.com.
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT