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QR Decomposition gives incorrect results for some singular matrices

description

QRDecomposition class gives incorrect results for some singular matrices, in which the resulting Q and R does not satisfy A = QR nor Q'Q = I
Here is an example A:
[0 0 0 -0.0037 0 1 -1 0
0 0 0 0.0037 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 1 0 0 0
0 0 0 0 -1 0 0 1
1 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0
0 0 1 0 0 0 0 0 ]

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