Matlab - Consulta para programar Matriz

clear all

n=input('ingrese el valor de n'); A=[];

for i=1:n

for j=1:n

if i==j

A(i,j)=13;

else if abs(i-j)==1

A(i,j)=-4;

else if abs(i-j)==3

A(i,j)=1;

else if abs(i-j)==5

A(i,j)=-1;

else if abs(i-j)==7

A(i,j)=2;

else if abs(i-j)==9

A(i,j)=-3;

else

A(i,j)=0;

    end

    end

    end

    end

    end

end

end

end

disp(A)