Hello,
Please keep this on the list, R-help is threaded and it becomes part of
the archives, maybe it will be usefull to others.
You are now asking 2 other different questions.
Are you looking for something like this?
two_values_mat <- function(n, fill = 1, diagonal = 0){
m <- matrix(fill, nrow = n, ncol = n)
diag(m) <- diagonal
m
}
two_values_mat(3)
two_values_mat(3, 0.5, 1)
odd_even_mat <- function(n){
even <- n %% 2 == 0
nr <- floor(sqrt(n)) - !even
nc <- ceiling(n/nr)
i <- c(0, seq.int(n - even))
matrix(2*i + !even, nrow = nr, ncol = nc, byrow = TRUE)
}
odd_even_mat(30)
odd_even_mat(17)
Hope this ehlps,
Rui Barradas
Às 11:52 de 23/05/20, Vahid Borji escreveu:
Thank you Rui,
Actually, I am making some matrix as follows:
0 1 1
1 0 1
1 1 0
matrix(rep(c(0,1,1,1),3),nrow=3,ncol=3)
and
1 3 5 7 9 11
13 15 17 19
21 23 25 27
29 31 33 35
i<-0:17 matrix(2*i+1,nrow=3,byrow=TRUE)
and
1 0.5 0.5
0.5 1 0.5
0.5 0.5 1
matrix(rep(c(1,0.5,0.5,0.5),3),nrow=3,ncol=3)
For all the above matrixes I have written a code (as you see below each
matrix) . If you want to make the above matrixes, will you use my codes
or will you have other simpler ways for making the above matrixes?
On Sat, May 23, 2020 at 2:39 PM Rui Barradas <ruipbarra...@sapo.pt
<mailto:ruipbarra...@sapo.pt>> wrote:
Hello,
Use diag() and cbind().
special_mat <- function(n){
if(n %% 2 != 0) {
msg <- paste(sQuote(n), 'is not a multiple of 2, will use')
n <- 2*(n%/% 2)
msg <- paste(msg, sQuote(n))
warning(msg)
}
x <- diag(n/2)
diag(x) <- seq.int <http://seq.int>(n/2)
cbind(x, (n/2 + 1):n)
}
special_mat(6)
special_mat(8)
special_mat(7)
Hope this helps,
Rui Barradas
Às 10:45 de 23/05/20, Vahid Borji escreveu:
> Hi my friends,
>
> I want to make the below matrix in r:
>
> 1 0 0 4
>
> 0 2 0 5
>
> 0 0 3 6
>
> I used the below code:
>
> matrix(c(1,0,0,0,2,0,0,0,3,4,5,6),nrow=3)
>
> My code works. But I do not like my solution way. I am thinking
to find the
> simplest way for making this matrix. Do you think my code is the
simplest
> code for making this matrix? If not, could anyone writes a
simpler code
> than my one?
>
> [[alternative HTML version deleted]]
>
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