Message-ID: <BFBEE2E3.13AC%sdavis2@mail.nih.gov>
Date: 2005-12-09T12:29:39Z
From: Sean Davis
Subject: R-how to group the data
In-Reply-To: <007001c5fcba$cfce7d60$57a3c5cb@srai37>
On 12/9/05 7:19 AM, "Subhabrata" <subhabratapal at sraindia.com> wrote:
>
> Hello R - users,
>
> This may sound simple to may people:
>
> I have a list of data as follows
>
> type value
> y 7
> y 7
> y 8
> y 8
> y 8
> y 9
> y 9
> y 9
> y 9
> y 10
> y 10
> y 10
> y 10
> y 11
> y 11
> y 12
> y 12
> y 14
> y 14
> y 14
> y 15
> y 17
> y 20
> y 20
> y 20
> y 20
> y 25
> y 25
> y 25
> x 7
> x 7
> x 8
> x 8
> x 9
> x 9
> x 11
> x 11
> x 11
> x 12
> x 12
> x 12
> x 13
> x 13
> x 15
> x 15
> x 15
> x 18
> x 20
> x 30
> x 30
>
> Is there any way where I can group all the x and y like
>
> a <- all the values of x
> b <- all the values of y
>
> so 'a' will have = 7, 7, 8....
> 'b' = 7,7,8,8,8...
Look at ?split.
vec <- c(1,2,3,4,5,10,11,12,13,14,15,16)
myletters <- c(rep('a',5),rep('b',7))
mylist <- split(vec,myletters)
mylist$a
mylist$b
Sean