Hi Sean, Here you go: sparsematrix.txt = row, col ,val 0,0,.42 0,1,.28 0,2,.89 1,0,.83 1,1,.34 1,2,.42 2,0,.23 3,0,.42 3,1,.98 3,2,.88 4,0,.23 4,1,.36 4,2,.97 The vector is just the third column of the matrix which should give the trivial solution of [0,0,1] This translates to this which is correct There are zeros in the matrix (Not really sparse but just an example) 0.42 0.28 0.89 0.83 0.34 0.42 0.23 0.0 0.0 0.42 0.98 0.88 0.23 0.36 0.97 Here is what I get for the Q and R Q: -0.21470961288429483 0.23590615093828807 0.6784910613691661 -0.3920784235278427 -0.06171221388256143 0.5847874866876442 -0.7748216464954987 -0.4003560542230838 -0.29392323671555354 -0.3920784235278427 0.8517909521421976 -0.31435038559403217 -0.21470961288429483 -0.23389547730301666 -0.11165321782745863 R: -1.0712142642814275 -0.8347536340918976 -1.227672225670157 0.0 0.7662808691141717 0.7553315911660984 0.0 0.0 0.7785210939368136 When running this in matlab the numbers are the same but row 1 is the last row and the last row is interchanged with row 3 On Mon, Nov 7, 2016 at 11:35 PM Sean Owen wrote: > Rather than post a large section of code, please post a small example of > the input matrix and its decomposition, to illustrate what you're saying is > out of order. > > On Tue, Nov 8, 2016 at 3:50 AM im281 wrote: > > I am getting the correct rows but they are out of order. Is this a bug or > am > I doing something wrong? > > >