% 1. spheres and cylinders
[x,y,z] = sphere(10);
size(x)

ans =

    11    11

surf(x,y,z)
[x,y,z] = sphere(100);
surf(x,y,z)
% tubes are made out of cylinders
t = 0:0.1:2*pi;
r = 0.5 + 0.5*sin(2*t);
% we use the r to define the distance from
% the axis of the cylinder
[x,y,z] = cylinder(r);
figure
surf(x,y,z)
r = 0.8 + 0.2*sin(2*t);
[x,y,z] = cylinder(r);
surf(x,y,z)
hold on
% let us put a sphere on top of the cylinder
[x1,y1,z1] = sphere(100);
% to lift the sphere we add 2*pi to the z1:
size(z1)

ans =

   101   101

z2 = z1 + 2*pi*ones(101,101);
% we added to the sampled heights in z1
% 2*pi in order to make z2
surf(x1,y1,z2)
z3 = z1 + ones(101,101);
figure
surf(x,y,z);
hold on
surf(x1,y1,z3);
% we can redefine the walls, permuting x, y, and z
% cones are special cylinders
figure
cylinder([0 1])
hold on
cylinder([1 0])
% note that cylinder, just as sphere makes samples
[x5,y5,z5] = cylinder([1 0]);
% we will lift the cone up, adding one to every
% z-coordinate
size(z5)

ans =

     2    21

z6 = z5 + ones(2,21);
surf(x5,y5,z6)
figure
surf(x5,y5,z6)
hold on
cylinder([0,1])
% 2. cubic spline interpolation
% to draw complicated pictures, we better use a script
edit
figure
drawcar
% we can change the directory
cd c:
pwd

ans =

C:\Documents and Settings\janv

ls

.                            
..                           
.alice                       
.drjava                      
Application Data             
Cookies                      
Desktop                      
Favorites                    
Local Settings               
My Documents                 
NTUSER.DAT                   
NetHood                      
PrintHood                    
Recent                       
SPLUS_Home                   
SendTo                       
SimplePictureProperties.txt  
Start Menu                   
Templates                    
WINDOWS                      
bluej                        
drawcar.m                    
gsview32.ini                 
jacorb.properties            
matlec5.txt                  
ntuser.dat.LOG               
ntuser.ini                   
ntuser.pol                   
openrct.properties           
vgalusr1.vr                  


drawcar
drawcar
drawcar
diary off