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https://issues.apache.org/jira/browse/MAHOUT-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590719#action_12590719
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Ted Dunning commented on MAHOUT-45:
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Not trig functions are need for Given's method. The coefficients are indeed
sines and cosines of a theoretical rotation angle, but you needn't ever compute
the angle since you can compute the coefficients directly.
See http://www.cse.uiuc.edu/courses/cs554/notes/ for a good exposition,
especially section 11. Golub and van Loan's Matrix computation is also an
excellent description.
Also, it is common to not actually construct the Q matrix explicitly.
> Matrix QR decomposition
> -----------------------
>
> Key: MAHOUT-45
> URL: https://issues.apache.org/jira/browse/MAHOUT-45
> Project: Mahout
> Issue Type: Improvement
> Components: Matrix
> Reporter: Sergey Chickin
> Priority: Minor
> Attachments: MAHOUT-45.patch
>
>
> Matrix QR decomposition and appropriate determinant calculator
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