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Topic: Unique QR decomposition
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Posts: 1
Registered: 7/17/13
Unique QR decomposition
Posted: Jul 17, 2013 1:45 AM
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I am a Mathematica beginner. I ran QRDecomposition on an invertible matrix and got negative diagonal elements in the R matrix. How do I get Mathematica to return all positive diagonal elements for R? According to Golub & Van Loan this should be possible and guarantees a unique solution. (I naively assumed that Mathematica would do this automatically.)

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