Can anyone tell me how to delete a row in a matrix? I have searched around and couldn't find a straightforward way to do this. Thanks, any help will be greatly appreciated. Jennifer [[alternative HTML version deleted]]
theMatrix = matrix(1:100, nc=5) theMatrixWithoutRow5 = theMatrix[-5,] b On Nov 19, 2007, at 3:35 PM, Barb, Jennifer (NIH/CIT) [E] wrote:> Can anyone tell me how to delete a row in a matrix? I have searched > around and couldn't find a straightforward way to do this. > > Thanks, any help will be greatly appreciated. > > Jennifer > > > > > > > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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.
Something like this?
> a=matrix(1:9, ncol=3)
> print(a)
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
> a=a[-2,]
> print(a)
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 3 6 9
You can use negative numbers to reference rows and/or columns, and
you'll get everything except the rows/columns referenced.
Julian
Barb, Jennifer (NIH/CIT) [E] wrote:> Can anyone tell me how to delete a row in a matrix? I have searched
> around and couldn't find a straightforward way to do this.
>
> Thanks, any help will be greatly appreciated.
>
> Jennifer
>
>
>
>
>
>
>
>
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.