% data for Exercise Set 2.4
       
ex = input('Exercise number (1-12)? ');
       
if ex==1
   v1 = [3;0;0], v2 = [-3;2;3], v3 = [6;4;0]
   disp('Remember that a homogeneous system should be analyzed using a matrix')
   disp('  that has an augmented columns of zeros.  For Exercise 1, you should')
   disp('  use a command such as:   M = [v1  v2  v3  zeros(3,1)]') 
elseif ex==2
   v1 = [-2;0;0], v2 = [8;0;-5], v3 = [-1;0;3]   
elseif ex==3
   v1 = [1;-5], v2 = [-2;10]   
elseif ex==4
   v1 = [-4;1], v2 = [12;-3]   
elseif ex==5
   v1 = [0;-6;1], v2 = [0;4;-2], v3 = [-8;-4;3]   
elseif ex==6
   v1 = [1;3;-2], v2 = [-3;-5;6], v3 = [0;5;-6]   
elseif ex==7
   A = [1 3 -2 0;3 10 -7 1;-5 -5 3 7]   
elseif ex==8
   A = [0 2 6 8;1 -3 -4 1;-1 4 7 3]   
elseif ex==9
   A = [3 4 3;-1 -7 7;1 3 -2;0 2 -6]   
elseif ex==10
   A = [3 4 9;-2 -7 7;1 2 -2;0 2 -6] 
elseif ex==11
   A = [1 1 0 4;-1 0 3 -1;0 -2 1 1;1 0 -1 3] 
elseif ex==12
   A = [1 -1 -3 0;0 1 5 4;-1 2 8 5;3 -1 1 3] 
else
   disp('No data for this exercise in Section 2.4.') 
end
