MATLAB: Split a diagonal matrix

Question

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

Answer 1

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