MATLAB: Create a diagonal matrix from a vector

Question

Hello,

Consider a 1×7 vector.

How can I create a 7×7 matrix where the main diagonal elements are zeros (m(i,i)=0) and m(i,j)=m(j,i)?

where,

i=1,…,7 the rows index

j=1,…,7 the columns index

Answer 1

 m(1)=0; 
 toeplitz(m)