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https://issues.apache.org/jira/browse/MAHOUT-45?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Chickin updated MAHOUT-45:
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Attachment: MAHOUT-45.patch
I've made an implementation according to
http://en.wikipedia.org/wiki/QR_decomposition but I still have a problem: I get
an error caused by storing doubles in memory and resulting in calculations
error(actually taking square root when calculating vector norm). So we normally
get non-integer determinant for matrix of integers(still it's close to desired
value)... This can actually result in significant error for big matrix
> 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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