accurate 3 D plotting

Hi I am trying to pot 3D shape of a pipe with radius 1, by when I try to plot it in surf it is forming triangulations but not a smooth surface, can anyone help me in forming a shape of the circular pipe, thanks in advance.

x0 = 0; 
y0 = 0;
t=0:1:90;
l=ones(9,90)
z=zeros(9,90);
x=zeros(9,90);
y=zeros(9,90);
for s=1:9
for i=1:1:90
  x(s,i) =  l(s,i).*cos(t(i));
   y(s,i) = l(s,i)*sin(t(i));
   z(s,i)=s  
end
end  
surf(x,y,z)
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
fontSize = 15;
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
zlabel('Z', 'FontSize', fontSize);

Answer 1

[Chad Greene]

I think it'd be easier to use the cylinder function or there a few entries on File Exchange that might help (e.g. TubePlot).