Re: [R] Non-procedural access to columns of a matrix

wdunlap tibco.com > -Original Message- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Joris Meys > Sent: Friday, June 18, 2010 5:08 PM > To: Iuri Gavronski > Cc: r-help > Subject: Re: [R] Non-procedural access to columns of a ma

Re: [R] Non-procedural access to columns of a matrix

On second thought, the addition only works in the case of a square matrix : x = matrix(c(11,12,13,1, 21,22,23,3, 31,32,33,2, 41,42,43,1, 51,52,53,3),byrow=T,ncol=4) > diag(x[,x[,4]]) [1] 11 23 32 41 53 works, but > diag(x[,x[,4]]) <- diag(x[,x[,4]])+5 > x [,1] [,2] [,3] [,4] [1,] 11 12

Re: [R] Non-procedural access to columns of a matrix

> diag(x[,x[,4]]) [1] 11 23 32 > diag(x[,x[,4]]) <- diag(x[,x[,4]])+5 > x [,1] [,2] [,3] [,4] [1,] 16 12 131 [2,] 21 22 283 [3,] 31 37 332 Cheers Joris On Fri, Jun 18, 2010 at 8:58 PM, Iuri Gavronski wrote: > Hi, > > I would like to have an index for a column