[R] row selection

Nutter, Benjamin
Thu, 08 Oct 2009 20:23:34 -0000

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

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at 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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