Dear useRs,
Trying to replace the diagonal of a matrix is not working for me. I
want a matrix with .6 on the diag and .4 elsewhere. The following
code looks like it should work--when I lookk at mps and idx they look
how I want them too--but it only replaces the first element, not each
element
On 10/3/2006 4:59 PM, roger bos wrote:
Dear useRs,
Trying to replace the diagonal of a matrix is not working for me. I
want a matrix with .6 on the diag and .4 elsewhere. The following
code looks like it should work--when I lookk at mps and idx they look
how I want them too--but it only
You are indexing with numeric 0's and 1's, which will refer to only the
matrix element 1,1 (multiple times), cf:
matrix(1:9,3)[diag(3)]
[1] 1 1 1
Try one of these:
idx - diag(3) 0
idx - which(diag(3)0)
idx - cbind(seq(len=n), seq(len=n))
(For very large matrices, the third will be
try:
mps - matrix(rep(.4, 3*3), nrow=3, byrow=TRUE)
idx - diag(3)
mps
[,1] [,2] [,3]
[1,] 0.4 0.4 0.4
[2,] 0.4 0.4 0.4
[3,] 0.4 0.4 0.4
idx
[,1] [,2] [,3]
[1,]100
[2,]010
[3,]001
mps[idx == 1] - rep(.6,3)
mps
[,1] [,2] [,3]
[1,]
On Tue, 2006-10-03 at 17:03 -0400, Duncan Murdoch wrote:
On 10/3/2006 4:59 PM, roger bos wrote:
Dear useRs,
Trying to replace the diagonal of a matrix is not working for me. I
want a matrix with .6 on the diag and .4 elsewhere. The following
code looks like it should work--when I
On Tue, 3 Oct 2006, Duncan Murdoch wrote:
On 10/3/2006 4:59 PM, roger bos wrote:
Dear useRs,
Trying to replace the diagonal of a matrix is not working for me. I
want a matrix with .6 on the diag and .4 elsewhere. The following
code looks like it should work--when I lookk at mps and idx
