[R] curious about dimension of 'apply' output when MARGIN=1

From: Benjamin Tyner <btyner_at_stat.purdue.edu>
Date: Tue 16 Jan 2007 - 21:30:37 GMT


Reading the documentation for 'apply', I understand the following is working exactly as documented:

 > M<-matrix(1:6,ncol=2)
 > M

     [,1] [,2]
[1,] 1 4
[2,] 2 5
[3,] 3 6
 > apply(M,2,function(column) column+c(1,2,3))

     [,1] [,2]
[1,] 2 5
[2,] 4 7
[3,] 6 9
 > apply(M,1,function(row) row+c(1,2))

     [,1] [,2] [,3]
[1,] 2 3 4
[2,] 6 7 8

I'm not proposing any changes or extra arguments to 'apply'. Rather, I'm wondering what is the benefit for (or rationale behind) this somewhat unintuitive behavior in the case that MARGIN=1.

Thanks,
Ben



R-help@stat.math.ethz.ch 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. Received on Wed Jan 17 08:37:02 2007

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Wed 17 Jan 2007 - 00:30:32 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.