Hi all,
I have a problem selecting some rows from a random data.
I'd like to select the same rows (before 0) .
For example:
A
[1] 0
[2] 1
[3] 2
[4] 0
[5] 1
[6] 0
[7] 1
[8] 2
[9] 3
[10] 4
I'd like to select the row where a = 2 1 4
I searched on the search of the R site but I did'nt find anything of simple.
Can someone help me?
Thank you very much
Seangduan
It is unclear what you really want so here are two solutions to two
different questions:
> A <- matrix(c(0,1,2,0,1,0,1,2,3,4), ncol=1)
> A
[,1]
[1,] 0
[2,] 1
[3,] 2
[4,] 0
[5,] 1
[6,] 0
[7,] 1
[8,] 2
[9,] 3
[10,] 4
> A[A[,1] %in% c(2,1,4) , ]
[1] 1 2 1 1 2 4
# the value of the entries in the rows where that attains.
# not interesting in itself other than allowing a count,
# but possibly useful if you were interested in a matrix with more
columns
> which(A[,1] %in% c(2,1,4) )
[1] 2 3 5 7 8 10
#the row numbers where membership in that set occurs.
On Apr 28, 2009, at 10:35 PM, sangduan jansomboon wrote:
>
> Hi all,
> I have a problem selecting some rows from a random data.
> I'd like to select the same rows (before 0) .
>
> For example:
> A
>
> [1] 0
> [2] 1
> [3] 2
> [4] 0
> [5] 1
> [6] 0
> [7] 1
> [8] 2
> [9] 3
> [10] 4
>
> I'd like to select the row where a = 2 1 4
>
> I searched on the search of the R site but I did'nt find anything of
> simple.
> Can someone help me?
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
thanks Seangduan sangduan J. wrote:> > > Hi all, > I have a problem selecting some rows from a random data. > I'd like to select the same rows (before 0) . > > For example: > A > > [1] 0 > [2] 1 > [3] 2 > [4] 0 > [5] 1 > [6] 0 > [7] 1 > [8] 2 > [9] 3 > [10] 4 > > I'd like to select the row where a = 2 1 4 > > I searched on the search of the R site but I did'nt find anything of > simple. > Can someone help me? > > Thank you very much > Seangduan > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > >-- View this message in context: http://www.nabble.com/Select-the-same-rows-tp23289646p23311532.html Sent from the R help mailing list archive at Nabble.com.