Matlab - problema con un for, solo me deja el ultimo valor

k=((1-2*u)/(2*(1-u)))^(1/2)

W=@(Z) (Q/Z^2)*(1/(2*k^2*pi))*(1/(1+(r/(k*Z))^2))^(3/2)

for i=1:15

    Y=W(i)

end

k=((1-2*u)/(2*(1-u)))^(1/2);

W=@(Z) (Q/Z^2)*(1/(2*k^2*pi))*(1/(1+(r/(k*Z))^2))^(3/2);

for i=1:15

Y(i)=W(i);

end

disp(Y)

Y  = W(1:15);

W=@(Z) (Q./Z.^2).*(1/(2*k.^2*pi)).*(1./(1+(r./(k.*Z)).^2)).^(3/2);

Y=W(1:15);

Y=arrayfun(W,1:15);

>> clear all

u=5*rand;

Q=rand;

r=rand;

k=((1-2*u)/(2*(1-u)))^(1/2);

W=@(Z) (Q/Z^2)*(1/(2*k^2*pi))*(1/(1+(r/(k*Z))^2))^(3/2) ;

for i=1:15

Y(i)=W(i);

end

Y

Y =

  Columns 1 through 11

    0.0156    0.0046    0.0021    0.0012    0.0008    0.0005    0.0004    0.0003    0.0002    0.0002    0.0002

  Columns 12 through 15

    0.0001    0.0001    0.0001    0.0001