Problem Typo  topic started 9/9/2004; 6:11:32 PM last post 9/13/2004; 1:00:10 PM 


Thomas Hagedorn  Re: Problem Typo 9/13/2004; 1:00:10 PM (reads: 1292, responses: 0) 
Arnie, Unfortunately, there seems to be a worse bug in the system with that problem. Again, its problem setLinearAlgebra1Systems/ur_la_1_20.pg If you use seed 4856, you'll get a problem with the variables chosen to be a=4, b=2, c=4, d=2, e=3, f=2, g=5, i=2, j=8, k=6, l=1 (in the problem's code). The solution should be (1,0,1,2,0,0) + s(4,1,0,0,0,0) + t(8,0,2,2,1,0) + u(6,0,2,5,0,1) If you enter that solution, you get credit. So far, so good. The problem is that the problem also evaluates the answer (2,0,1,2,0,0) + s(4,1,0,0,0,0) + ... same as above as correct. But it isn't correct. In fact, it appears to me that changing any of the the first vectors's entries not corresponding to the free variables x_2, x_5, x_6 results in a correct answer. I looked at the code and it seems to me that the error must be occuring in the subroutine vec_solution_compare of the macro vec_solution_cmp. But I'm not proficient enought to have found the error. Tom free 