 Hi all,

Thank you for your help. Now I am able to select every 5th row of the data
from the main data set (x)
using

sub1<- x[seq(1, nrow(x), by=5), ]


So sub1 contains one fith of the data set  X.  I want also create another
data set that will contain the remaining  data set from X (ie., four fifth
of the data set).

Any help is highly appreciated.








I have a matrix  named x with N by  C
I want to select every 5 th rrow from matrix x I used the following
code
> n<- nrow(x)
>> for(i in 1: n){
> + b <- a[i+5,]
>> b
> }



>sc < x[seq(1, nrow(x), by=5), ]

>
> -----Original Message-----
> From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-project.org]
> On Behalf Of David Winsemius
> Sent: Thursday, October 08, 2009 4:19 PM
> To: Ashta
> Cc: R help
> Subject: Re: [R] row selection
>
>
> On Oct 8, 2009, at 4:14 PM, Ashta wrote:
>
> > Hi all,
> > I have a matrix  named x with N by  C
> > I want to select every 5 th rrow from matrix x I used the following
> > code
> > n<- nrow(x)
> >> for(i in 1: n){
> > + b <- a[i+5,]
> >> b
> > }
> > Error: subscript out of bounds
>
> What did you expect when "i" in your loop counter became one greater
> than the number of rows?
>
> >
>
>
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
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