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From Iman Mohtashemi <iman.mohtash...@gmail.com>
Subject Re: TallSkinnyQR
Date Tue, 08 Nov 2016 14:41:04 GMT
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 <sowen@cloudera.com> 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 <iman.mohtashemi@gmail.com> wrote:
>
> I am getting the correct rows but they are out of order. Is this a bug or
> am
> I doing something wrong?
>
>
>

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