split a diagonal matrix

v = [2 1 4];
D = diag(v)

Having a diagonal matrix, i wanted to split the diagonal matrix as below

M1 = [
     2     0     0
     0     0     0
     0     0     0]
M2 = [
     0     0     0
     0     1     0
     0     0     0]
M3 = [
     0     0     0
     0     0     0
     0     0     4]

working for any dimension diagonal matrix

[Jos (10584)]

What do you mean by "working for any dimension diagonal matrix" ?

Any number of elements in V? In that case, see my answer below.

Answer 1

[KSSV]

v = [2 1 4]; 
nx = length(v) ; 
M = zeros(nx,nx,nx) ; 
for i = 1:nx
    M(i,i,i) = v(i) ;
end

Answer 2

[Jos (10584)]

Having a vector V with any number of elements, this does the job:

V = [2 1 4]
n = numel(V) ; 
M = zeros(n,n,n) ; 
M(linspace(1, n^3, n)) = V 

If you have a diagonal matrix D, use V = diag(D) first.