Benilton Carvalho wrote:
in that case, wouldn't
diag(diag(foo))
suffice?
Yes (beware the length 1 case, though).
However, don't delete the bug report. That error message is just wrong:
if (is.array(x) && length(dim(x)) != 1L)
stop("first argument is array, but not matrix.")
b
On May 14, 2009, at 4:30 PM, Michael Spiegel wrote:
The intent of diag(foo, 2, 2) was to return a matrix that is a 2 x 2
matrix which contains only the diagonal entries of the matrix foo. I
can't do diag(foo) because this returns a vector. I could reach my
goal with matrix(diag(foo), nrow = nrow(foo), ncol = ncol(foo)). If
this is not a reasonable thing for diag(<matrix>, <numeric>,
<numeric>) to return, then at the very least the error message should
be changed, as the first argument is in fact a matrix.
On Thu, May 14, 2009 at 3:24 PM, Benilton Carvalho
<bcarv...@jhsph.edu> wrote:
My understanding is that providing nrow and ncol, you want to create a
diagonal matrix with those dimensions.
diag(pi, 6, 6)
and that by
diag(foo, 2, 2)
you really meant
diag(foo)[2]
Apologies if I misunderstood.
b
On May 14, 2009, at 10:45 AM, michael.m.spie...@gmail.com wrote:
Full_Name: Michael Spiegel
Version: 2.9.0
OS: linux
Submission from: (NULL) (204.111.252.142)
The diag() function appears to reject the first argument when it is a
matrix,
and nrow and ncol arguments are also provided.
foo <- matrix(c(1:4),2,2)
foo
[,1] [,2]
[1,] 1 3
[2,] 2 4
diag(foo)
[1] 1 4
diag(foo, 2, 2)
Error in diag(foo, 2, 2) : first argument is array, but not matrix.
is.matrix(foo)
[1] TRUE
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