sub3 <- x[-seq(1, nrow(x), by=5), ] Notice the '-' in front of the seq() command. This will select everything but what is in the sequence.
________________________________ From: Ashta [mailto:sewa...@gmail.com] Sent: Friday, October 09, 2009 12:42 PM To: Nutter, Benjamin Cc: r-help@r-project.org Subject: Re: [R] row selection 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-boun...@r-project.org [mailto:r-help-boun...@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 ______________________________________________ R-help@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. =================================== P Please consider the environment before printing this e-mail Cleveland Clinic is ranked one of the top hospitals in America by U.S. News & World Report (2008). Visit us online at http://www.clevelandclinic.org for a complete listing of our services, staff and locations. Confidentiality Note: This message is intended for use\...{{dropped:13}} ______________________________________________ R-help@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. =================================== P Please consider the environment before printing this e-mail Cleveland Clinic is ranked one of the top hospitals in America by U.S. News & World Report (2008). Visit us online at http://www.clevelandclinic.org for a complete listing of our services, staff and locations. Confidentiality Note: This message is intended for use\...{{dropped:16}} ______________________________________________ R-help@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.
