% data for Exercise Set 5.5

ex = input('Exercise number (11-18)? ');

if ex==11
   v1 = [1;0;2], v2 = [3;1;1], v3 = [9;4;-2], v4 = [-7;-3;1] 
elseif ex==12
   v1 = [1;-2;0], v2 = [-3;4;1], v3 = [-8;6;5], v4 = [-3;0;7] 
elseif ex==13
   A = [1 -6 9 0 -2;0 1 2 -4 5;0 0 0 5 1;0 0 0 0 0] 
elseif ex==14
   A = [1 3 -4 2 -1 6;0 0 1 -3 7 0;0 0 0 1 4 -3;0 0 0 0 0 0] 
elseif ex==15
   A = [1 0 9 5;0 0 1 -4] 
elseif ex==16
   A = [3 4;-6 10] 
elseif ex==17
   A = [1 -1 0;0 4 7;0 0 5] 
elseif ex==18
   A = [1 4 -1;0 7 0;0 0 0] 
else
   disp('No data for this exercise in Section 5.5.')
end
