On 2024-12-04 7:38 a.m., Gerrit Eichner wrote:
Dear list,
is anyone aware of the following behavious of diag when used to replace
diagonals (plural!) of a matrix?
Small example: The following is documented and clearly to be expected:
A <- matrix(0, nrow = 5, ncol = 5)
diag(A) <- 1; A
BUT, what about the following? When executing the code of `diag<-` line
by line, it throws errors. So why does it work?
diag(A[-1, ]) <- 2; A
diag(A[-5, -1]) <- 3; A
diag(A[-5, -(1:2)]) <- 4; A
Could you show us the log of what you did that generated errors? The
statement `diag(A[-1, ]) <- 2` is pretty complex; it involves two
assignment functions (both `diag<-` and `[<-`), so you might have tried
to execute the wrong thing.
Duncan Murdoch
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