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https://issues.apache.org/jira/browse/MAHOUT-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590686#action_12590686
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Sergey Chickin commented on MAHOUT-45:
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For Givens method if we have n-dimension matrix we have to calculate n(n-1)/2
rotation matrices each needs 5 trigonometric functions. And then multiply all
those matrices by given to get Q matrix. This could be quite time complex
comparing to other methods...
> 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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