m3= magic(3);
m4= magic(4);
r= [3 4 5];    %row vector
c= [3; 4; 5];  %column vector
m= [r; r+1; r+2; 0:2] %3 x 3 matrix
x= 1 & 2;
y= 0 & 3
x= 1 | (x/0);
y= 1 || (x/0);