MATLAB: How to form this diagonal matrix

diagonal matrix

E= diag [ 1  e^j*((2*pi)/M)........e^j*((2*pi)/M)*M-1 ]

where M=1024 and E= M x M diagonal matrix

m = 4;
M = 1:m;
diagVals = exp(j*2*pi*(M-1./M))
E = diag(diagVals)

Is that right?

Here M is your matrix

[right_eig_vectors, eig_val, left_eig_vectors] = eig(M);

 m(1)=0; 
 toeplitz(m)