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Sign differences amoung QR solutions.
2009 Feb 12
0
Sign differences amoung QR solutions.
....0000000 14 [2,] 0.4285714 -175.0000000 70 [3,] -0.2857143 0.1107692 -35 > qr.Q(r) [,1] [,2] [,3] [1,] -0.8571429 0.3942857 0.33142857 [2,] -0.4285714 -0.9028571 -0.03428571 [3,] 0.2857143 -0.1714286 0.94285714 > When I feed this matrix into http://www.bluebit.gr/matrix-calculator/calculate.aspx I get: R -14.000 -21.000 14.000 0.000 -175.000 70.000 0.000 0.000 -35.000 Q -0.857 0.394 0.331 -0.429 -0.903 -0.034 0.286 -0.171 0.943 Which seems to agree with the results of 'R' This same matrix on http://en.wikipedia.org/wiki/QR_...