
x = 0, 
y = zeros(5);
z = x + y;

x = eye(5);
y = eye(8);
z = x + y;

x = [ 1,2,3,4,5 ];
y = [ [1,2,3,4,5],
      [1,2,3,4,5] ];
z = x + y;

x = zeros(5);
y = zeros(5,7);
z = x + y;

x = ones(3,5)
z = x[7,10]
v = x[2,3,4]