 containment active'><div class = "S1"><span class = "S2"><span class="S0">Here is the system that ``broke" LU factorization for us.</span></span></div><div class = 'CodeBlock contiguous'><div class = 'inlineWrapper'><div class = "S4 lineNode"><span class = "S5"><span class="S0">A = [ 2 0 4 3; -2 0 2 -13 ; 1 15 2 -4.5 ; -4 5 -7 -10 ];</span></span></div></div><div class = 'inlineWrapper'><div class = "S4 lineNode"><span class = "S5"><span class="S0">b = [ 4; 40; 29; 9 ];</span></span></div></div></div></div