How to create matrix with array under certain conditions?

I have an array:

A=[1.3 1.2 1.3]

How can I get matrix B using A?

B=[1.3 1.3 1.3; 1.3 1.2 1.3; 1.3 1.3 1.3]

Matrix B has the value of A at the central row,column,and diagonal.

[José-Luis]

You mean two diagonals? Otherwise two of the values of the resulting matrix are undefined.

Answer 1

[Chandrasekhar]

B = [ones(1,3)*A(1); A; ones(1,3)*A(1)]